RECORD: Darwin, C. R. 1834.12. Zoological diary: Chiloé. CUL-DAR31.283-285. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Richard Darwin Keynes in Zoology notes (2000, F1840). Revised and supplemented here by Christine Chua to correspond to the manuscript images. Edited by John van Wyhe 6-7.2022. RN1

NOTE: Original transcription reproduced with permission of Richard Darwin Keynes, the Syndics of Cambridge University Library, English Heritage (Down House Collection) and William Huxley Darwin.


283

Chiloé

1834 December

Holuthuria= Doris 1097 Adhæring to a stone in 16 Fathom water; near island of Huafo.— an animal close allied to the Holuthuria (Doris-like) described page 215.— Length .4: elongated oval: snail shaped, upper surface slightly convex covered with minute stony points, sides protected by four or five rows of scales, the rounded extremities of which point from each side upwards to wards centre of back: at anterior & posterior end of animal & above the margin, there is a projecting pap or cone capable of extension & retraction; round the base of these, small scales are visible & the stony points.— the whole surface of back is scattered over with cylindrical papillæ; extremities bluntly rounded. These are susceptible of motion, irritation & contraction but to no very great degree.— They seem to arise from between the scales.— The paps at extremities are equally covered with these, as rest of body; hence where drawn in, they appear as two bushes or groups of papillæ.— One of the paps (anterior?) is very much pointed, its terminal orifice is closed by 5 or 6 triangular pieces or scales.— I could not exactly see form of posterior orifice.— The paps highly irritable. It is probable tree-like tentacula are hidden within the anterior pap, but they were not protruded.— (NB. The animal had been kept a week in water, hence perhaps little irritability of papillæ) When the animal slowly crawls, it is a pointed oval, but when at rest it is nearly circular & the paps are projected as in Ascidia.— I do not know the use of the Papillæ, perhaps partly prehension.— The flat under surface is surrounded under margin or base of

[283v]

(a) The papillæ seem slightly protected by the Hyaline stony points.— the scales on centre of back are very obscure, as indeed all the scales are when compared to animal P 215

284

Chiloé

1834 December

Holuthuria= (a) Doris scales by a row of adhæring papillæ, also down the centre there is an irregular double row.— These papillæ are organized precisely as described in [sketch]. animal P 215 When in action they extend adhere without the edge of body.— Habits same as animal P 215.— Color "Flesh red".

Peronia Blainville (1092) (2421 dry)

Body when partly crawling blunt oval, posterior extremity truncate & retracted above Branchial orifice. This latter large, circular, widely open.— convex, when firmly adhæring conical.— Above blueish blackish blue, with pale projecting points & pale halo round each; edge with narrow alternate square spaces of white & blue; the latter color appearing Vascular: beneath white, excepting mouth.— Tentacula short with terminal black eye; beneath which a bifurcate membrane hood over mouth.— Inhabits in great numbers the tidal rocks where confervæ grow, amidst Balanidæ & the shells (2364).— Isd of Tanqui Doris (1091) Surface of animal almost dry, from length of period during which it is uncovered.—

Doris Isd of Caylen.— common under large stones; color pale yoke of egg=yellow: foot & mouth darkest. Mantle far surpassing foot on all sides, surface with rounded papilli points of two sizes. Form of superior tentacula & Branchiæ exactly same as described in Doris P151.— (to which species this is closely allied). Branchiæ same color with mantle. Dimension, when partly crawling, 2 inches, breadth 1.1.—

Cavolina 1091 (a) Under stones.— General color "Crimson & Brownish purple R". Mouth & under side finer rose color. Branchiæ composed of conical fillets (basal parts leaden colored) arranged in numerous transverse rows on each side of back. Animal broard, truncate anteriorly tapering to tail hence triangular. Length, when crawling, 1.5, broardest .6: Anterior & inferior /over

[284v]

(a) tentacula placed far apart, (at each corner of truncate extremity), very long, tapering, pointed, tipped with white; posterior & superior tentacula, blunt & much shorter, placed between behind some of the first rows of Branchiæ.—

285

Chiloé

1834 December

Frog (1086) (a) Copied Under side: throat, breast & cheeks rich chesnut brown, with snow white marks; thighs blackish of hinder legs blackish with do marks. legs yellowish also with do marks.— Upper side, pale iron-rust color, with posterior parts of body, thighs & anterior marks (one triangular & other transverse) beautiful bright green.— iris rust color. pupil black.— eyes small.— appearance very pretty & curious.— Nose finely pointed.— Jumps like a frog. inhabits thick & gloomy forest. Isd of Lemuy .—

Planaria PL.14, Fig: 3 represents lower surface 2422 Found under round stone in a numerous group, in brackish water. Chonos Archipelago.— Length .2, breadth about .06.— The vascular system brownish purple, hence animal has this tint:— seen from above upper surface; there is a fine narrow inverted wedge shaped mark of dark color on anterior extremity; in centre of back a circular patch clear of color; color on back seems laid on in fine striæ.— Lower surface, white: Shape pointed oval, broard & rounded posteriorly; anterior extremity square, truncate & shouldered; this part (A) is prehensile by suction caused by folding edges towards each other; thin body much depressed, edges very thin: crawls something like a leach by adhæring with anterior extremes & dragging up body afterwards (in both last respects very different from the terrestrial Planariæ) can swim, back downwards, or rather it is crawling on upper surface of water.— As in the land Planariæ, there is in first half of body a central vessel, which sends off short, (moss-like) branching vessels full of granular matter.— The wedge shaped organ in head appears to be its altered extremity: on each side & attached to it (nearest to on dorsal surface) there is a black eye.— The central vessel, about middle of animal is joined to the foot-stalk of the protrudable. Found under round stone in a numerous group, in brackish water. Chonos Archipelago.— Length .2, breadth about .06.— The vascular system brownish purple, hence animal has this tint:— seen from above upper surface; there is a fine narrow inverted wedge shaped mark of dark color on anterior extremity; in centre of back a circular patch clear of color; color on back seems laid on in fine striæ.— Lower surface, white: Shape pointed oval, broard & rounded posteriorly; anterior extremity square, truncate & shouldered; this part (A) is prehensile by suction caused by folding edges towards each other; thin body much depressed, edges very thin: crawls something like a leach by adhæring with anterior extremes & dragging up body afterwards (in both last respects very different from the terrestrial Planariæ) can swim, back downwards, or rather it is crawling on upper surface of water.— As in the land Planariæ, there is in first half of body a central vessel, which sends off short, (moss-like) branching vessels full of granular matter.— The wedge shaped organ in head appears to be its altered extremity: on each side & attached to it (nearest to on dorsal surface) there is a black eye.— The central vessel, about middle of animal is joined to the foot-stalk of the protrudable ball

[285v]

1835 Feb:

1178 (a) This species is excessively common in the forest of Valdivia. Seems subject in its colors to remarkable variation.— Specimen (1178) under surface posteriorly jet black & snow white marks, anteriorly rich chesnut brown: above cream color, with triangular slightly darker shades & small marks of green.— (There is a point in all at joint of hind legs.— iris of all is rusty red).—

1179 Above cream-colored, without shade of green: hinder legs yellow; beneath all black with different shaped marks of white.—

Another, beneath anteriorly the brown is replaced by bright yellow.— upper surface instead of cream color, rusty red — with darker triangular shading.— All die soon in confinement.—


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

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