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Fır. 7. The suture of a portion of the lateral grove

uniting with the above, in which the trans

verse pieces are concave.
8. Suture of the intermediate grove

divided at
the ridge (Fig. 3. 6.). Teeth obtusan-

gular.
9. A circular space round the mouth,

vered with little oblong scales. In the
centre is the mouth with its five converg-

ing teeth.
10. Outside of one of the five pyramidal jaws,

in which the teeth are planted.

a. The jaw. b. The tooth.
11. Inside of ditto : a. the jaw, consisting in-

ternally of two triangular transversely

furrowed, and probably molary plates.
12. A little bristle, terminating in a knob with

three awns, planted amongst the spines
on the shell, and, according to Cuvier,

a species of Polype (Pedicellaria).
13. Another Pedicellaria? expanded like a

tripetalous blossom.
14. One of the spines of Echinus esculentus.

-208-211

13

PLATE III. B. CRINOIDEANS. Fig. 1. Pentacrinus Asteria

... vol. ii. 2. Portion of ditto, exhibiting the suckers on the

under side of the fingers

12

PLATE IV. TUNICARIES.

FIG. 1. Cinthia Momus

2. Salpa cyanogastra
3. Pyrysoma giganteum
4. Cephalitis Bowdichii
5. Clavellina borealis...

230 223 227 222 230

1 Regn. An. iii. 297.

PLATE V. BIVALVE MOLLUSCANS.

Page 240

262

Fig. 1. Solen Siliqua

a. The foot. b. The shell.

N.B. The two figures in outline shew varia-
tions in shape assumed by the foot, under

different circumstances.
2. Anomia Cepa
a. The tendon. b. The aperture of the upper

valve through which it passes.
3. Anomia Ephippium.

a. Aperture.
4. Terebratula
a. Aperture of the lower valve through which

the tendon passes.
5. Trigonia margaritacea

a. Foot formed for leaping.
b. b. b. Valves of the shell.

263

264

PTEROPOD AND HETEROPOD MOLLUSCANS.

6. Cliodites fusiformis
7. Polycera capensis..
8. Pterotrachea rufa

267 301

PLATE VI. UNIVALVE MọLLUSCANS.

282

Fig. 1. Voluta æthiopica, to shew the animal...

a. The eye, shewing iris and pupil.
b. The right hand tentacle.
c. The proboscis exserted.
d. The frontal margin of the head.
e. The respiratory tube or siphuncle.
f. Appendage at its base. Analogous to the

crus infundibuli in Nautilus ? 1 Owen.
g.g. The two gills, of which the right hand one

1

has but one series of laminæ. h. Termination of the alimentary canal.

1 Owen's Mem. on Naut. Pompil. t. v. h.

Page

291

i. i. The right hand margin of the mantle.
k. The male organ.

1.1. The foot. Fig. 2. Ianthina ...

a. The mouth, composed of two vertical cartila

ginous lips, minutely toothed at the margin.
6. The shell.
c. The air-vesicles forming an out-rigger.

[blocks in formation]

| Referred to by mistake as an Octopus, 308.

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