202 PROCEEDINGS OF THE CALIFORNIA 



icately mottled with whitish ; whorls five, convex, last one gibbose, sub-angu- 

 lated at the periphery, closely lineated with large, unequal-sized, elevated spiral 

 strise ; umbilicus whitish, small, with deep spiral grooves within; aperture 

 roundly sub-quadrate, pearly-white ; outer lip rather thin. 



Height four ; diameter, five mill. 



Habitat, Yiti and Samoa Islands. 



A very rare species, only found in the condition of dead shells. 



GiBBULA PRASINA, Grt. 



Shell very small, thin, sub- pellucid, depressly globose, dingy green, with 

 paler mottlings ; whorls four, strongly convex, the last one very large, rounded, 

 lineated with small, closely-set, spiral ridges, which become obsolete on the 

 base, and cancellated with microscopical, raised lines of growth ; umbilicus very 

 small, simple ; aperture rounded, green within, and articulated with dark dots ; 

 outer lip thin. 



Height, three ; diameter, four mill. 



Habitat, Viti Islands. 



A few examples were gathered from the under side of loose stones on shore 

 reefs. 



Genus Thala, H. and A. Adams. 



Thala exquisita, Grt. 



Shell elongate, slender, fusiform, solid, shining, light pink, with whitish shades, 

 and sparingly dotted with brown ; whorls eight or nine, flatly convex, longitu- 

 dinally and transversely ridged ; ridges small, closely-set, with small nodes at 

 their intersections ; base contracted and slightly recurved ; aperture very nar- 

 row, nearly half the length of theshell ; outer lip thickened and crenulate with- 

 in ; columella with five small plaits. 



Length, twelve mill. 



Habitat, Paumotu Islands. 



A rare and beautiful species found washed up on sandy beaches. 



Thala violacea, Grt. 



Shell solid, elongate, slenderly fusiform, shining, violet ; whorls six or seven ; 

 flatly convex, regularly granulated throughout ; base slightly recurved ; aper- 

 ture narrow, half the length of the shell ; outer lip thickened and crenulate 

 within ; columella with five or six very small plaits. 



Length, seven mill. 



Habitat, Samoa and Viti Islands. 



A rare species found under stones or reefs. 



Genus Cantharus, Bolten. 

 Ca'ntharus pilaris, Grt. 

 Shell solid, elongate, slenderly fusiform, light brownish, with whitish mot. 

 tlings and spirally lineated with deeper brown ; whorls seven, convex, longitu- 

 dinally and spirally ridged ; ridges small, granulated at their points of intersect- 

 ing ; the transverse ones alternately larger and smaller ; base contracted and 



