TKIXOSTOMA. 1<>7 



peripheral carina, prominent and eremite at the suture, base flattened, 

 widely umbilicated, the umbilicus bordered by a crenate angle ; 

 aperture horizontal, subbasal, peristome thickened, duplicate, con- 

 tinuous, callously reflected. I Mam. '2 mill. 



China Sea. 



A bi/arre affair, which differs widely in appearance from the type 

 of the group. 



T. mi'ucATA, Fischer. 



Like the preceding species, but smaller, more convex above, and 

 concave below, last whorl radiately ribbed, carinated below, ribs 

 paired, uniting in a pre-sutural tubercle. Diam. 1*7-5 mill. 



China Sea. 



Unfigured. 



Subgenus CIRSONELLA, Angas, 1877. 

 T. AUSTRALE, Angas. PI. 35, figs. 83, 84. 



Globosely turbinate, narrowly umbilicated, semi-opaque, smooth, 

 shining, white ; whorls 4, convex ; the last large, rounded at the 

 periphery; aperture circular, peristome continuous, slightly thick- 

 ened on the columellar margin. Diam. 2 mill. 



Botany Bay, N. S. Wales, Australia. 



Subgenus HAPLOCOCHLIAS, Carpenter, 1864. 

 T. CYCLOPHOREUS, Carp. 



Compact, small, solid, whitish or light yellowish ; whorls 5, rap- 

 idly enlarging, suture impressed; very minutely spirally striate, 

 shining ; aperture rounded, peristome continuous, thickened, varicose 

 exteriorly, inner lips distinct ; umbilicated in the juvenile, adult 

 rimate. Diam. 5 mill. 



Cape St. Lucas, Lower California. 



Subgenus CYNISCA, H. and A. Adams, 1854. 

 T. (IRANULATUM, A. Adams. 



Orbicularly depressed, widely umbilicated, white, with granular 

 spiral ribs, last whorl rounded, umbilicus patulous, perspective, cal- 

 lously margined, aperture rounded, columella sinuate, lip thickened 

 within, subcreiiulated. 



Philippines'. 

 No dimensions or figure. 



T. JAPONIC A, A. Ad. Unfigured. 



This is said to = Collonia pilala, Dunker. 



