Sates AUD jae Pa te 
ah li be ha 
a 
ONE ES 
eee 
~ 
the Land Pulmoniferous Mollusca into Families. 269 
subcaudal gland, and a deep central dorsal posterior groove ; 
this may be the type of another family. 
So great is the difficulty of procuring the animals of exotic 
Jand-shells for examination, that we can make only very gradual 
attempts at revising the arrangement of them ; and great caution 
becomes necessary, since we find that shells similar in external 
appearance and character have animals of different conformation 
and habits. ; 
7. CrypTettapz. Mantle central, large, shield-like, free in 
front. Young animal with an operculum, which is at length 
deciduous, and protected by an external shell, which afterwards 
becomes hidden in the shield-like mantle of the adult animal. 
Jaw and teeth of Helix. Cryptella, Drusia, and Gerasia (Cat. 
pp. 7 & 61). 
8. AneITEADz. Mantle small, inequilateral, flat, sunken, 
enclosing a shelly plate. Back with a central groove, giving 
out opposite branches to the sides. Neck with two distinct 
diverging grooves to the lips. Jaw horny; teeth square. 
Aneitea. 
9. JANELLADZ. Mantle verysmall, convex, sunken in the dorsal 
grooves, enclosing four small plates. Back with a single central 
dorsal groove. Neck with two grooves, parallel and close to- 
gether behind, and then separating and extending to the out- 
side of the eye-peduncle. Skin spinulose. Tongue very broad. 
Teeth oblique, strongly dentated. Janella. 
*%*% Mantle covering the whole of the back. Respiratory chamber 
small, thin, in the front of the body, separate from the mantle. 
Head without any groove. Evye-peduncle and tentacle distinct. 
Jaw and tongue like Helix. 
10. Puinomycenipz. Philomycus and Meghimatium. (See 
Cat. p. 156.) 
B. Head, eye-peduncle, and tentacles simple, contractile. Teeth 
numerous, four-sided, close on the lingual membrane. 
11. Vermicettips. Body elongate. Tentacle bifid. (See 
Cat. p. 4.) 
12. Oncurp1apz. Body ovate. Tentacles cylindrical, simple. 
(See Cat. p. 4.) 
