BY R. M. JOHNSTON, F.L.S. 



Genus Haminea. Linn. (442 ) 



99 



Shell oval, globular, spiral, ventricose, corneous, thin, covered 

 by a slight smooth epidermis ; spire involute ; lacks the 

 colours of Bulla. 



(lvi.) Family Lophoceeilve. 

 G-enus Akeba. Muller. (443.) 

 Shell like Bulla, thin, flexible, globosely cylindrical; spire 

 truncated; whorls channeled ; aperture long, expanded 

 and deeply sinuated in front; outer margin disunited 

 at the suture ; columella open, exposing the whorls. 

 Dist.— Greenland, Great Britain, Mediterranean, East 

 Indies, Australasia. 



(lvii.) Family Aplysiimi. 

 Shell wanting or rudimentary, and covered by the mantle ; 

 oblong, trigonal or slightly convoluted; large, slug-like 

 animals. 



Genus Aplysia. Gmelin. (444-445.) 

 Shell oblong, convex, flexible and translucent, with a posterior 

 slightly incurved apex. (Sea-hare.) Dist— West 

 Indies, Norway, Britain, Mediterranean, Mauritius, 

 China, Australasia. 



(lviii.) Family ViraiNiDiE. (Land Shells.) 

 Shell usually thin, corneous, transparent, spiral, of few rapidly 

 enlarging whorls. 



Genus Vitbina. Drap. (446-448.) 

 imperforate, very thin, depressed ; spire short, last 



Shell 



whorl large ; aperture large, lunate or rounded ; 

 columella margin slightly inflected; peristome often 

 membranous. Dist.— Universal, mostly inhabit cold or 

 temperate countries or mountain regions of warm 

 countries. 



(lix.) Family Helictd;e. (Land Shells.) 

 <&hell spiral, usually thicker than in the Zonitidse, and mostly 

 with reflected lip, the aperture edentulous or contracted 

 by teeth.) 

 „ Genus Helix. (449-518.) 



e of ^variable form, smooth, rugose, striate, ribbed or 

 tuborculate, sometimes pilose; orbicular convex, 

 planorbid, trochiform subturriculated, or short 

 buiimiform (monstrosities sinistral, or with the whorls 

 more or less uncoiled) ; aperture oblique, oval or 



