[61(i)]

(38

Pyrgoma cancellata (Brit. Mus) (1) Whole Shell on caryophillia, from above, figure the narrow end of orifice downwards: orifice not central, nearer carina. (2) shell internal view of; (loose specn. Brit: Mus: Board) show form of sheath you have not at all yet shown peculiar angularly bent line of sheath; I think you will have to shade specimen as if held a little obliquely & the thick, barely articulated not yet shown septa, forming the basal margin of the walls. [insertion:] Vide John Lubbocks drawings (3) Scutum: internal view position as to make the recipient shoulder of this genus stand parallel to edge of articular & shoulder of scutum. (no 12 on Card. Brit. Mus.) attend to occludent edge of scutum (4) Tergum internal: attend to a plate, hollow underneath, extending from the carinal margin to the articular ridge: basal margin a little hollowed out (5) Scutum external [insertion:] make lines of growth on upper part plain thy occur plainer than now. (no 11. Card: Cuming) attend to knobbed occludent margin continuous on upper & lower part of valve: look a little obliquely & articular ridge can just be seen (6) Tergum internal like this: the furrow expanding or forming a space not shown & no lines of growth shown: repair basi-carinal angle from sp no 12. — Look & copy lines of growth of Mr Lubbocks drawing.­─make lines of growth parallel to basal margin plainer.—

[61(ii)]

[top of page excised]

on its inner margin & apparently [within] & with the ultimate segment is proportionally longer &, I believe, carrying six spines, of which two appeared to be longer & more flexible than the other four shorter & somewhat hooked spines. (B) Not only throughout the order, but throughout the whole Class, the antennæ are singularly uniform in structure as will be seen, when the two last orders are described. —

Eyes.— These present no difference except in size, throughout the class; & have been sufficiently described in my former volume. The true basal articulation segments of the each the antennæ (incorrectly designated formerly as sternal plates or segments) are separated from each other

[Cirripedia, p. 119]

[61(ii)v]

This is the hand writing of my Father Charles Darwin

Horace Darwin

Dec 21. 1916

[Children's drawing]

[61(iii)]

The basis is firmly cemented to the surface of attachment. The whole shell, basis & operculum consists, as we have also already seen, of the three anterior cephalic first segments of the head modified into a singularly constructed carapace which encloses the mouth & rest of the body. The anterior extremity is situated in the centre of the basis, where indeed by due care the antennæ of the larva pupa may be always detected: & the posterior extremity is directed vertically upwards.) II (When the shell of a sessile cirripede or barnacle, for instance of a Balanus is first

[Cirripedia, pp. 33-4]

[61(iv)]

Balanus [top of page excised]

membrane of these five posterior thoracic zoonites segment is [illeg] thin is very is thin, excepting small small wedge-shaped no port portions along the medio-dorsal line.

The infolded articulations are much wider between the zoonites segments supporting the three anterior pairs of cirri, (at least in the Balaninæ) are much wider than those between the three posterior zoonites segments; the former segments with their cirri, being thus capable of being moved further apart from each other. allowing the former to have more play & causing the anterior cirri to stand further apart. C Could there have been any

[Cirripedia, p. 67]

[61(v)]

[top of  page excised]

[illeg] margin of the ganglion, & run for some distance in a sheet, parallel & close together:  the pair however, going to the second pair of cirri, almost immediately arise more branches off from the others. Each Each of these nerves enters at the inner & posterior edge of margin of the cirrus, to which it belongs; and, at least in the case of the first pair, divides into two branches as they it enters. The nerves entering going to the fifth & sixth pairs of cirri, are more closely united together, than are the others; & appear till they divide branch off, like a single large nerve: that which belongs to the sixth cirrus, divides gives off,

[Cirripedia, p. 89]

[61(vi)]

(11

Mr Sowerby

a. Bal. unguiformis: lateral view: draw 2 1/2 nat.

a. Chief character, straight, not quite with summits of radii — & general─line. —

a. (do) same size, lateral view of erisma with folded walls, wrapped up in silver [pa]per. —

Scutum, external view: (specn on card) same size fig 8a in Pl. 8 — surface rather smooth — a [text excised] rather a flexure parallel &

[Cirripedia, p. 296]