SHELLS. 447 



PLATE XL. Figs. 12, 13. 



HELIX SA3I0ENSIS, Baird. 



Shell small, depressly globular, thin, pellucid, shining, of a 

 light horny coloiu", paler beneath, quite smooth, rather flat under- 

 neath, imperforate, ■«'ith an umbilical pit ; whorls 4^ in number, 

 last convex ; suture margined ; aperture lunate ; labrum thin, 

 sharp ; columella with a small white callus at its junction with 

 the body of the shell. 



Breadth 3 lines. 

 Height 1^ lines. 

 Hah. Samoan group. 



