Ww 
. Bulla aperta, seen underneath. 
. Bulla aperta, partly dissected. 
. The tongue of the Bulla aperta greatly magnified. 
. Helix pomatia, taken from its shell, and seen on the left side: a large 
PLATE XVI. 
. Bulla aperta entire, seen on the back. 
a. The fleshy plate which covers the front of the body, or the tentacular 
disk 
c. .. part containing the shell. 
. Bulla aperta on the right side, with the ventral fleshy plate separated 
from the dorsal, to shew what is between them. | 
a. The tentacular disk. e. The anus. 
b. .. plate serving as a foot. | f. .. common orifice of the male 
organ and oviductus, 
b. The plate serving as a foot. 
¢. .. part containing the shell. 
d. A part of the branchiz. 
a. The stomach. e. The heart. 
b: .. cesophagus. poate syeuivels 
d. .. branchie. g. .. intestine. 
h. testicle. 
portion of the covering of the pulmonary cavity has been taken away 
to shew its position; also the teguments of the remainder of the spire, 
to shew the situation of the heart, the bag of viscous matter, etc. 
a. The large right tentaculum| 4. The hole for respiration seen 
half developed. : within the pulmonary ca< 
P v Pp ry 
b. .. hole whence the left vity. 
tentaculum issues. i .. diaphragm. 
c. .. hole for the small tenta- ‘ 7s : 
Gulia! Ghhibie sani teeo heart and auricle in their 
Gag. proper place im the open 
dd. .. two lobes of the veil or pericardium. 
upper lip. 0. commencement of the great 
ece. .. edges of the foot. < artery of the spire. 
> Two of the lobes placed un- 
a gs ne 
det Ocal pe ee 
ge. The pad of the collar. q: irst part ol the intestine, 
hh. .. place where the cover- | r-. second part. 
ing of the pulmonary | 55;—  .. _—_Jobes of the liver. 
cavity has been cut 
away. 
We .. rectum. 
