bo 
-T 
bo 
ASSIMINITDA. 
Lacunopsts, Desh. 
Distr.—3 sp Cambodia. Fresh water. ZL. Jullieni, Desh. 
(Ixxiii, 89). 
Shell depressed, solid, neritiform; base plane, with a sub- 
marginal angle; aperture small, semilunar; lip and columella 
greatly thickened. 
SPEKIA, Bourguignat, 1881. Growth-lines oblique, crossed at 
right-angles by striz ; a small obsolete funicule behind the colu- 
mellar lip. L. zonata, Woodward (Ixxiii, 90,91). LL. Tangan- 
yika, Africa. 
SupraMity POMATIOPSINA. 
Shell and operculum as in Rissoine. Foot with lateral sinus. 
Amphibious. 
PomaAtiopsis, Tryon. 
Syn.—Chilocyclus, Gill. 
Distr.—United States, Central America. P. lapidaria, Say 
(Ixxiii, 92). 
Shell elongated, perforate, smooth, whorls very convex ; aper- 
ture round; peristome continuous, slightly expanded or reflected. 
The animal of Pomatiopsis prefers damp locations in the 
vicinity of streams, but does not, ike Amnicola, live habitually 
under water. It is an air-breather, but possessed of a true gill. 
Its locomotion is effected by first protruding and attaching the 
snout, then carrying the front of the body forward, and finally 
drawing the posterior parts after, a motion very like that of 
Assiminea and very different from Amnicola. 
Famity ASSIMINIIDA. 
Shell small, globose-conical, with sharp lip. Opereulum pauci- 
spiral, corneous. 
Animal with eyes at or near the ends of the tentacles as in 
the helices. 
Terrestrial or amphibious. 
ASSIMINEA, Leach. 
Syn.—Syneera, Gray. Optediceras, Leith. Hydrocena, in. 
part. 
Distr.—Europe, Asia, America, a few species. A. Grayana, 
Leach (1xxiii, 93). 
Shell not perforated or slightly slit, oval-conic, with moderate 
Spire; aperture rounded-oval, entire; columellar lip somewhat 
thickened. Animal. Tentacles rather short, the eye-peduncles 
connate with them to their ends. The Indian species, A. Fran- 
cesie, can often be seen for days together on dry land, walking 
or rather leaping with great rapidity like a caterpillar of the 
