


28, silicious teeth from the tongue of Aply- 
sia. 
29, ditto of Ovula. 
30, ditto of Melania. 
31, ditto of Janthina. 
32, ditto of Magilus. 
33, ditto of Bullcea aperta. 

PLATE 5, LAMELLIBRANCHIATA AND 
BRACHIOPODA, 
Fic. 1, Aspergillum Javanum—anteri- 
or part of the shell. 
2, the disk or rose. 
3, the animal extracted. 
4, ditto exposed by dissection in the shell. 
5, the animal of Vulsella, the left valve and 
the side of the mouth being removed. 
6, ditto of Perna. 
7, ditto of Solemya. 
8, ditto of Trigoniz. 
9, ditto of Cyrenoidea. 
Generalreferences tothe Lamellibranchiata. 
+, the mouth: f foot: 6, branchise: p, labial palps: 
m, adductor muscles: 7, retractor do: s,stomach: 
h, heart: c, crystalline body: a, anus. 
10, 11, 11’, fossil Spirifers, showing their 
interior. 
12, Crania anomala. 
aa, the spiral arms: 066, the adductor muscles: 
d, the rectum emerging from the liver, which 
opens into the stomach. 
13, the lower valve, mouth, muscles, and 
_ ovaries. 
14, the same as 12, but showing 
c, the mouth: ee, the intestinal canal: 6, the anus. 
15, a portion of the mantle magnified, also 
a portion of the liver, and ova from the 
mantle. 
16, 17, 18, and 19, the anatomy of a species 
of Lingula from Amoy 
c, cilia surrounding the margin of the mantle : 
the lobes of the mantle with the vessels and res- 
mM, 

piratory striz : 
common to both : 
a, the spiral arms haying a canal 
o, the mouth with two ganglia 
uponit: J, the liver of a greener colour than the 
reproductive glands (ov) which apparenily open 
between the mantle-folds in front of the hearts: 
h, the hearts, each consisting of a red-coloured 
auricle and ventricle: 1, 2, 3, 4, 5, 6,7, muscles : 
the stomach and intestine, into the former of 
which the liver sends three ducts, are seen in Fig. 
18. They abounded in Foraminifera. 
, a microscopical section of a pearl of the Mytilus 
edulis, shewing the dark nucleus and waved nacre: 
b, section of the shell of Crania: 
Anomia: d, nacre from Vulsella : 
"a Perna. 
c, surface of 
7, surface of 
20’ round particles from the venous organ 
of mollusks. 
a, of the Unio: 5, of the Helix: c, of the Lymneus: 
d, of the Purpura. 
21, the Pedal ganglia and acoustic sacs of 
Cvclas cornea (480 diam.) 
PLATE 6, CIRRIPEDA AND ARTICULATA, 
(NERVOUS SYSTEM ONLY OF THE LAQTER), 

Fig. 1, Lepas anatina—the capitulum 
opened and the pedicle sliced. 
+, the mouth: ov, ovaties, from which ducts lead 
towards the openings at the base of the first cirri 
o, the opening by which the fluid is admitted be- 
neath the envelope of the animal’s body from the 
canal of the pedicle: e, the eye to which a trans- 
parent spot (t) of tunic corresponds: ad, the 
muscle closing the valves, above which isseen the 
double cerebral ganglion giving nerves to the ped_ 
icle and optic filaments: 6, branchie: a, the 
lower cirri having in their base the supposed an- 
ditory sac and an enclosed capsule which appears 
to be deciduous: c, the cirri: , the penis. 
1’, a view of the animal shewing 
(d) the oviduct, the eye, (e) and the transparent point 
in the tunic (s) to admit the light. 
2, the Gymnolepas Cuvieri with its auri- 
cles and five rudimentary valves. 
3, the same with the horny tunic removed 
and sliced to shew the interior ova, §c 


