



6 and 6’, spermatic capsules, §c., from the 
oviduct of the female Sepiola. 
7, a plan of the circulation in the Sepia. 
a, veins from the feet, eyes, and head passing through 
a foramen in the front of cranium, and joined by 
veins 6, from the buccal mass and nervous 
centre, to form the commencement of the cava 
descendens: c, veins of the siphon: d, of the 
mantle: e, hepatic: jf, secreting processes: g 
veins of the stomach: 7, of the ink-bag, &c.: h, 
veins from the ovary and bottom of the sac: 7, 
-veins of the mantle: A A, the branchial hearts 
with their appendages: j, branchial arteries: 
i, branchial veins: 6, systemic heart opened : 
1, the inferior aorta going to the viscera, ink-bag, 
glands, and bottom of the sac: m,asmall artery : 
n, the superioraorta: 0, artery going to the sides 
of the mantle: p, hepatic: g, salivary: 7, the 
aorta as it enters the cranial cartilage giving off 
branches (¢) to the buccal mass, others (w,) 
entering the orbit by a foramen on each side, the 
vessels then uniting again and lying at first be- 
tween the esophagus and the lower ganglion of 
the sub-esophageal mass, then coming forwards 
(v) between the arteries and posterior ganglia, to 
be distributed to the feet (w). 
8, the posterior view of a Cleodora, shewing 
the genital orifice, &c. 
9, front view of do. 
10, viscera of do. unfolded, 
o, mouth: s, stomach: A, heart: 
t, testis, 
@, anus : d, liver 
Ii, the back part of the mantle and its 
muscular fascicles. 
12, the branchial tissue magnified. 
13, the front view of Hyalea. 
o, the mouth. 
14, the back of do. the eyes, tentacles, and 
The vis- 
cera are not figured, as they are given 
by Cuvier, and differ but little from 
those of Cleodora. 
_ genital openivgs being seen. 




PLATE 3, GASTEROPODA. 
Fig. 1, the animal of the Ovula, shewing 
the reflection of the mantle and situation 
of some of the viscera, marked by dotted 
lines. 
2, Magilus with the termination of its tube 
or shell. 
3, animal of Nerita littoralis, Lin. 
3’, its nervous system with visceral and 
branchial ganglia. 
a, Ancylus fluviatilis: 6, its anatomy, the branchia 
anus &c, being sinistral. 
5, the anatomy of Natica glaucina, its re- 
tractor muscle and operculum beingseen 
behind. 
6, Doris tuberculata, shewing its internal 
organs developed, the foot and mantle 
removed, the branchiz only partially 
left ; there are minute ganglia on the 
stomach as well as eye-spots on the 
brain, the generative organs are on the 
right, they having been reversed by 
Cuvier’s engraver as in other instances. 
7, the brain of Eolis (Cavolina) versicolor. 
8, the brain of D. tuberculata as seen from 
below with the acoustic spots. 
C,brain: P, pharyngeal ganglia : m, nerves of the man- 
tle: b,ofthe branchie: /f, ofthe feet: 7,nerve 
forming the subesophageal ring: g, of the geni- 
tal organs: 4, of the tentacles: o, of the mouth 
and its muscles. 
9, the brain of the Helix aspersa, the ring 
being divided above and laid out. 
C. cerebral part of the ring or collar: /P, pharyngeal 
ganglia: ‘++,arteries: d, olfactory nerve: op. 
optic do.: ¢, do. to tentacles: g, genital: p, to 
the foot: m, tothe mantle and respiratory collar : 
n, to the side of the neck: »v, visceral. 
9’, the nervous system of Lymnzus stag- 
nalis. 
10, the anatomy of the common Aplysia, 



