CYLICHNA. 321 



prominent point. Alt. 0"088 in., diam. 0"044. jNIoutli breadtli at 

 same place 0'007 inch {Wats.). 



Tahiti Harbor, near the reefs, 20 fms. 



a tahitensis Wats., Chall. Rep. Gastr. p. 665, pi. 49, f. 11. 



This is very possibly a young shell. 



C. FiJiENSis E. A. Smith. Unjignred. 



Shell very much elongated, uarrow, cylindrical, a little contracted 

 in the middle, white, transversely very finely striated, the striae 

 more distant toward the vertex, longitudinally striated with indis- 

 tinct growth lines. Vertex (which is surrounded by an acute mar- 

 gin) profoundly umbilicate ; base subperforate. Aperture very nar- 

 row above, dilated below ; columella a little thickened, spirally 

 twisted, joined to the apex by a thin callus. Alt. 6, diam. 2 mill. 

 {Sm.). 



Fiji Is. 



C.fijiensis Sm., Ann. Mag. N. H. (4), ix, p. 352. 



A pure white shining species, of nearly the same form as C. bi- 

 plicata A. Ad., but rather narrower, with the columella only spiral- 

 ly twisted, and the transverse strioe finer {Sm.). 



C. NITENS E. A. Smith. Unfix/nred. 



Shell ovate, semi-pellucid, bluish-white, shining, longitudinally 

 indistinctly and transversely at top and base striated. Vertex 

 minutely umbilicated. Aperture narrow, dilated at base ; lip solid, 

 thick ; columella thick, provided with a small tooth or tubercle in 

 the middle ; umbilical region subperforate. Alt. 5, diam. 22 mill- 

 {Sm.). 



Fiji Is. 



C. nitens Sm., Ann. Mag. N. H. (4), ix, p. 351. 



A small semitransparent bluish-white species, chiefly character- 

 ized by the thick labrum and columella which has a small tooth or 

 tubercle on the middle of it {Sm.). 



Var. : Shell larger, less solid ; alt. 6, diam, 3 mill. 



South African and South Atlantic Species. 



C. TUBULOSA Gould. Unfigured. 



Shell of moderate size, elongated, cylindrical, sensibly enlarged 

 above and below, whitish ; smooth or sculptured with revolving 



