AURICULID^. 95 



Shell minute, cowical-pupiform, very thin, hyaline ; whorls not 

 numerous.; aperture suboval, usually contracted by teeth, one 

 or two on the columellar, and frequently one on the outer lip ; 

 columella plicate, or plication obsolete. 



Tentacles rather large, cylindrical, obtuse ; foot thick, obtuse 

 behind. 



CARYCHioPSis, Sandberger. Lip with two interior teeth. C. 

 Dohrni^ Desh. Fossil. 



Laimodonta, Nuttall. 



Distr. — 10 sp. Pol3mesia. L. Sandwichensis, Soul, (cii, 88). 



Shell oblong-oval, impex-forate, thin, with revolving striae; 

 spire elevated-conic ; aperture oval ; inner lip with three plica- 

 tions, the anterior smallest, outer lip sharp, with a transverse 

 interior plication. 



Distinguished from Ophicardelus by the internal elevated rib 

 of the outer lip. 



Marinula, King, 1831. 



Distr. — 10 sp. Australia, Mediterranean, W. Coast of 

 America. 31. pepita^ King (cii, 89). 



Shell oval-oblong, imperforate, solid, smooth ; spire short, 

 sharp ; aperture oval ; inner lip rather thick, excavated with 

 three plications, the posterior largest ; outer lip simple, sharp. 



CoBLESTELE, Bensou, 1864. 



Syn. — Francesia, Paladilhe, 1872. 



Distr. — 12 sp. India, Egypt, Arabia, Spain. C. scalaris, 

 Benson (cii, 19). 



Shell imperforate, elongate-cylindrical, aperture semiovate ; 

 columellar margin with a subspiral plica above ; peristome thin. 



Melampus, Montfort, 1810. 



Syn. — Conovulus, Lam., 1812. 



Distr. — 120 sp. Universal, mostly tropical. Fossil. Miocene 

 of Touraine. M. luteus, Quoy (cii, 80). 



Shell oval-conoidal, or suboval, solid ; spire rather short ; 

 aperture elongated, narrow ; columellar lip with several denti- 

 form plications ; columella plicate; outer lip sharp, interior with 

 revolving ridges. 



Foot truncated in front, bifid or siibbifid behind, divided 

 below into two unequal portions by a transverse groove. Jaw 

 fibrous, slight, curved, with sharp extremities. Teeth nearly 

 horizontal, the central smaller than the laterals — which are tri- 

 cuspid, marginals serriform. 



M. bidentatis, Say, is one of the commonest of salt-marsh 

 shells on the Atlantic coast of the United States. 



