98 PROVISIONAL AID TO THE STUDY OF TASMANIAN MOLLUSCA. 



(Hi.) Family Philinid^i. 

 Genus Philine. Ascanias. (436.) 

 Shell bulliform, not forming a single whorl, internal, white, 

 translucent, oval, slightly convoluted ; spire rudimentary 

 Dist. — West Indies, Boreal Atlantic, Mediterranean, 

 East Indies, Australasia. 



(liii.) Family TouNATELLiDiE. 

 Shell spiral, ovate, convolute or involute, spire more or less 

 elevated ; surface mostly spirally punctated; aperture 

 usually high and narrow, truncate or roundish in front; 

 columella solid. 



Genus Tornatina. D'Orb. (437.) 

 Shell oval, elongated, conical or fusiform, with revolving- 

 punctated stria? ; aperture long and narrow, widened 

 in front, entire ; lip sharp ; columella thickened, but 

 without plications. Dist. — Almost world-wide. 



Genus Bjngicula. Desh. (438.) 

 Shell minute, ventricose, with small spire ; aperture notched ; 

 columella callous, deeply plaited; outer lip thickened and 

 reflected. Dist. — In all warm seas. 



(liv.) Family CvLiCHNiDiE. 

 Shell external, spiral, more or less cylindrical ; nearly white ; 

 no operculum. 



Genus Cylichna. Loren. (439-440.) 

 Shell strong, cylindrical, smooth, or punctate-striate ; spire 

 minute or truncated ; aperture narrow, rounded in 

 front ; columella callous, with one plait. Dist. — 

 Chiefly deep water shells, Greenland, Britain, Red Sea, 

 Australasia. 



(lv.) Family Bullid^e. 



Shell spiral, ventricose, rather thick, maculated and banded in the 

 typical genus, white in others ; spire involute, external, 

 but usually partly covered by the lateral lobes of the 

 foot. 



Genus Bulla. Linn. (441.) 



Shell oval, globular, smooth, spotted, marbled or zoned; 

 spire concave; aperture as long as the shell; inner 

 margin without columella; outer lip trenchant. 

 Dist. — Universal. 



