14, 
. Trochus levis, List. 
A. The head. P. The foot. 
ee. .. eyes. f «filaments. 
wu... tentacula. o. .. operculum. 
p- «+ male organ. 
Purpura. 
kh. The head. 7. The trunk. 
ce. .. eyes. p- + foot. 
tt, .. tentacula. o. .. operculum. 
. Buccinum undatum, half the natural size, seen on the left side; the 
trunk drawn in, and the male organ turned back, and hidden in the 
branchial cavity. 
a. The male organ. 
c. .. siphon. 
dd. .. position of the branchiz. 
e. The position of the heart, 
R mucous plates placed to the 
right of the branchiz. 
. Buccinum undatum, with the trunk and male organ extended, 
a. The male organ. 
b... trunk. 
c. «. siphon. 
. Natica ee Fossar, Adan. magnified. 
h. The head. tw. The tentacula. 
ee. .. eyes. 0. .. operculum. 
i... fleshy appendages at the 
base of each tentacu- 
lum. 
. Natica 
m. The mouth 
B iets! (is 
