316 STOMATELLID^, 



the periphery; inner lip somewhat expanded, and in the middle 

 reflexed ; umbilical margin orenulated. The group is founded 

 upon three species from Japan ; cretaceous and tertiary species 

 occur. It is doubtfully distinct from Solariella. M. Japonica^ 

 A. Ad. 



UMBONELLA, A. Ad. Shell globosely conoidal, solid, porcel- 

 lanous, polished, narrowly umbilicated ; aperture subquadrate, 

 the margin simple, a little dilated in front ; umbilicus narrow, 

 margin crenulately rugose. If. murrea^ Reeve. Japan. 



VlTRTNELLA, C. B. Ad. 



Distr. — 18 sp. W. Coast Centr. Am., West Indies. V. ano- 

 mala, d'Orb. (Ixxxi, 12). 



Shell minute, depressed turbiniforra, widely umbilicated; aper- 

 ture large, rounded. 



VALVATELLA, Gray. Shell conic ; whorls rounded, with laminar 

 periostraca ; axis imperforate; aperture circular, peristome simple. 

 V. Groenlandica, Gray. 



BATHYMOPHILA, Dall. When young umbilicated like Margarita, 

 but the nearly adult has a broad, flattened, minutely granulated 

 pillar, with a polished small tubercle at its end ; the adult has 

 this tubercle enlarged, forming a blunt tooth, with granulated 

 surface. M. euspira, Dall. W. Indies. 



? Cltsospira, Billings, 1865. 



Distr. — G. cu7'iosa, Billings. Silur. ; Canada. 



Trochiform, surface reticulated ; aperture widely expanded all 

 round in a plane which is at a right-angle (or nearly so) to the 

 longitudinal axis of the spire, the latter conical. The cavity 

 occupied by the animal appears to be, at least in the lower part, 

 not spirally coiled, as in the ordinary gastropods, but straight 

 and central, with the lip spread out all round, trumpet-like. There 

 is some evidence that towards the apex of the spire it is spirally 

 coiled. 



Position uncertain ; may be more nearly allied to Trochita. 



Family STOMATELLID^. 



Shell paucispiral, auriform, the last whorl rapidly enlarging 

 to the aperture, nacreous within. Operculum, when present, 

 corneous, multispiral. 



Animal too large to entirely enter the shell. 



Stomatella, Lam. 



Etym. — Diminutive of stoma, the aperture. 



Distr. — 33 sp. Cape, India, North Australia, China, Japan, 

 Philippines. S. imbr-icata. Lam. (Ixxx, Yo). S. Cumingii, A. 

 Ad. (Ixxxi, 74). 



