GASTEROPODA. APLYSIADZ. 33 
between two membranaceous crests, the one of the czecum, the 
other from the liver. The czcum is as long as the second 
stomach, is imbedded in the liver, and simple in its internal 
surface. The intestinal canal, after leaving the third stomach, 
is simple in its structure, equal in its diameter; and after 
making two turns amongst the lobes of the liver, terminates 
in the anus. 
The food of the Aplysie consists of marine plants, and mi- 
nute testaceous, as well as naked mollusca. 
1. APLYSIA VARIANS. 
A. corpore suboyato, nigricante aut brunneo-purpureo imma- 
culato, intensé-purpureo aut brunneo-purpureo albido macu- 
lato, vel purpureo-brunneo nigro maculato. 
Laplysia depilans, Penn. Brit. Zool. iv. 42. t. 21. fig. 21. 
Habitat in Anglize Occidentalis mari non infrequens. 
Body somewhat ovate, blackish, or brown purple, without 
spots ; deep purple, or brown purple, with white spots ; of 
purple brown, spotted with black. Length from two to four 
inches. ; 
Shell longer than broad, longitudinally rayed, rather more 
than an inch in length, and three quarters broad. 
This species is common on the coasts of Cornwall, Devon, 
and Dorsetshire, and is found amongst the rocks, or is taken 
by the nets of fishermen. It crawls very slowly amongst the 
rocks, and has the power of swimming by successive uadula- 
tions of the foot, and of creeping on the surface of the water 
with its foot uppermost, like the genera of Limnade. 
Genus 13. Esmra. 
Sypho respiratorius ad capitis basin posticé ductus. Testa 
subantica. Pes postice non productus. 
Syphon produced to the hinder part of the base of the head. 
Shell situated somewhat anteriorly. Foot not produced behind. 
