8. 
3. Fissurella entire, covered with its shell, which is set in the edges of its 
mantle. 
: open. 
a. The disk of the foot. g. The heart. 
bb. .. circular muscle which | 747°. auricles. 
joins it to the shell, | _ . i 
and which has been| “ -- Intestine. 
cut. k. .. cesophagus. 
b. A portion of this muscle re- | 7. . pharynx. 
maining with the man- 4 
tle. mm. .. salivary glands. 
ce. Themantle thrown back,and |’ nz. .. lateral ganglions ofthe brain. 
seen on the under side. . 
z As ieee WAY .. extremity of the tongue. 
d. .. hole with which it is a a Som 
pierced. pe a oliver. 
ee. .. branchie, q: .. oyarium. 
pr eee ane 
Vermeius, Adanson. 
c. The tentacula. o. Operculum. 
Y. .. eyes: M. Mantle. 
P; <.. foof. A, Aperture by which the animal 
F. Cylindrical filaments. breathes. 
9. The same animal seen underneath. 
p. The foot put on one side, to make it more apparent. 
B. The mouth, 
T Bourdich fithog 
o 
