14. Brain of the Polypus; 
a. The ring round the so-) dd. The lateral ganglions. 
phagus. | e. .. abdominal plexus. 
b. .. brain. 
ce. .. optical ganglions. | 
41.* Brain of the Aplysia. 
a. The ring round the cesophagus. 
b. .. brain. 
e. .. abdominal ganglion. 
42. The animal and shell of the Helico-Limax elongata. 
43. Janthina penicephala, with its yesicular appendage (spuma cartila- 
ginea) attached to the posterior part of the foot. 
14. Aplysia. 
a. The head. 
b. .. inferior tentacula. 
c. superior 
d. eyes. 
e. .. mantle. 
fi. + operculum of the branchie. 
45. The female Sigaretus seen underneath: the head and foot a little bent, 
to shew the entrance of the branchial cavity. 
a. The notch. | 4. The anus. 
46. The male Sigaretus seen underneath. 
a. The notch. d. The anterior part of the foot cleft 
bb... tentacula. transversely. 
cc. .. foot. e. .. organs of generation: 
Of .. edges of the mantle. 
47. Carinaria Mediterranea. 
18. Plectophorus with its shell. 
19. The female Vivipara taken out of its shell. 
a. The foot partly folded in two. 
b. .. operculum attached to the posterior part. 
c. .. head with the tentacula and trunk. 
d. .. little siphon prolonged under the right tentaculum. 
e. .. lateral membrane of the left side. 
f. edge of the mantle. 
g. A small portion of the branchie shewing itself from underneath. 
h. The orifice of the womb and anus. 
20. Halyotis, drawn from the living animal, with all its ornaments. 
