18

1832 February 14th

Creseis Upon upper edge of this mantle, which continually contracts & expands itself & which is rather irregular, are situated ciliæ such as described near mouth: likewise in centre they may be discovered rapidly driving about small grains of matter (& the ova?). The middle part of sheath is surrounded by lines or rings.— At upper extremity, near where the head joins, there are vermiform tubular appendages, which I am nearly sure can be protruded beyond the shell.— May they not be similar to those in Limacina?— .— Beneath this are sent forth two tubes.— one transparent & ending in globular ball (within another membrane?), which is always pulsating.— the heart?— the other is a strength gut which gradually tapers to the shells end.— At its upper end it continually contracts & dilates itself, close to which is [a] small dark organ, the liver?, & a mass of green small balls.— ova?—

Creseis (a) Tapering, extremity not much pointed, curved: animal same as former one.— only that perhaps vermiform appendages were more apparent: & necessarily from shortness of shell, the intestine beneath the liver & green granular substance much shorter.— As it is the mantle or sheath that surrounds this part, which chiefly aids in retracting the animal, it almost necessarily follows that this process would be slower when this part was shorter, & this is the case.

[18v]

(a) 107 & 155

(b) 108

(a) On 23d of March: in about Lat 18°5′ & Long 36° W, the sea contained great numbers of this Atlanta.— Shells varying (largest specimens) 1/20 of inch in diameter.— Whorls four touching each other, the three internal ones purple, tapering suddenly: mouth of shell posteriorly cut out: not much carinated:

(b) PL. 3 Fig 8A no side ridge such as in A. Peronia of Blainville: Shell flat when seen from above (or edgewise) sides equal: whorls coiled obliquely & spiral.— so that on one side a slanting umbilicus can be seen on the & only a few of the whorls.— on the other all the whorls & no umbilicus: Only differs from No 8 (not spirits) in being of a purplish colour & generally smaller.— from 7 not spirits in whorls touching each other: If this latter, as I suppose, is A. Peronia, Blainville has drawn his figure with oblique ridges on the side which do not exist.— V No 385 (not spirits).

19

1832 February Limacina Atlantic (a) Dic. Class

Atlanta, Limacina Cuvier Cuvier.— very small. fine violet. slightly carinate. whorls touching each other.— In one specimen, only small portion of whorl coloured.— 2 others uniformly.— I should think they were full grown & if so a new species.

Porpita. (b) Porpita. Feb 14th.— 2°30′ N.— prussian blue. width .07. back rounded, slightly tuberculated, convex. slightly striated from centre, where there is a brown mark. Surrounding membrane, narrow, stiff, scalloped.—

Fig. 8, B''' Beneath depending, surrounded by numerous tentacula; extremities of which are divided into 4 papillæ, & being placed on one side give an hand like appearance.— Some of them are fully extended & are longer than diameter of the animal, the greatest number are much retracted.— Stalk of tentacula transparent, with an interior tube which terminates in a bag at the foot of the papillæ.—

Fig. 8, C These papillæ are thin, delicate, transversely lined, with a globular much tuberculated head.— The occasional protrusion of some of their tentacula has given rise to the idea that there were 2 sorts of them.— Vide Cuvier.— Mouth white, membranous, tubercular, projecting, round which is a row of simple vermiform tentacula, of a China blue.

[19v]

(a) No 223 not in spirits

(b) no 109

(c) Do

(a) Observed the same species growing on gum dissolved in vinegar.— (March 23d) found a sort very like this on old paste; the colour was yellow, & the stalks rather longer in proportion, were the only differences I could perceive.

20

St. Jago to Fernando Noronha

1832 February

Mucor (a) Mucor. Linn: growing on a lime from St. Jago, length .1 of inch. brown colour: pedicel hollow, simple, transparent, diameter .0006.— At extremity ball containing sporules, diameter .007.— Sporules varying in size, very minute, about .00009 in diam: When the mould was placed in water, the balls burst longitudinally, & sent forth the Sporules.— at same time globules of air passed down the pedicel.—

This took place with such violence that the recoil on the ball gave it sufficient motion to be visible to the naked eye.— The same results occurred with greater force when Spirits of Wine was used instead of water.— Was it not a similar observation that first led Dutrochet8 to the discovery of the Laws of Endosme?

Dyphyes (b) Dyphyes.— Plate 3 Fig 9.— Feb 17th. Lat 1°30′ S.—

(A) Square pyramidal, apex obliquely truncate. side slightly hollowed, with a projecting curved dotted rim on one side.

(B) Another species, an solid oblong placed on a square base & projecting over on one side.— On In upper parts is a net work bag. (the animal?) from which two appendages were sent off into the lower part.— I could see no signs of two animals joined.

Salpa (c) Salpa. Fig 10. Mantles rounded with four ridges or angles.— fringed beyond the mouth.— Mouth consists of a membrane stretched across the opening, with circular aperture.—

(a) Was unable to preserve it in spirits

21

1832

Planaria (a) [in margin:] 80 miles from Fernando, 150 from America

Planaria. Plate 4, Fig 1.2 — Febr 23d. Lat 5° S, 33° W.─ length .2: Colour pale: membrane with edges jagged; anteriorly formed like a neck & head with 2 ear like processes.— Beneath near to the neck is an internal quadrangular membrane within which is a black spot, by the side of this is an opening which the animal can dilate & contract at its pleasure.— Joining to this part is an oval bag with an internal dark spot & delicate tube.— This bag terminates behind a central dark Mass formed by the union of eleven veins [3 words illeg] or rather a congeries of grains.—

[in margin: Fig 1 Vide A B (Planoceros)

In centre of the Mass there is a longitudinal opening through which the animal can protrude a dark coloured very delicate membrane.— This membrane is close when first seen, clewed up into eight divisions. The animal evidently bears a close relation to the Planaria (?) described in Page 15.— The two bags in this instance answering to the two pap-form orifices.— & the organization central mass is much the same in both cases: in this one however there is no mass of eggs.— One is tempted to consider the membrane as lungs, & the veins which branch off from the centre as a circulatory system.— Is it not extraordinary finding an animal adapted for creeping in such a situation; so many miles from shore.—

[21v]

(a) These fins as well as the Pectorals which are placed just before branchial apertures, are in a continued state of tremulous motion even when the animal is at remains still.

(a) No 132