316 STOMATELLID. 
the periphery ; inner lip somewhat expanded, and in the middle 
reflexed ; umbilical margin crenulated. The group is founded 
upon three species from Japan; cretaceous and tertiary species 
occur. It is doubtfully distinct from Solariella. MM. 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. J. murrea, Reeve. Japan. 
VITRINELLA, C. B..Ad. 
Distr.—18 sp. W. Coast Centr. Am., West Indies. V. ano- 
mala, d’Orb. (Ixxxi, 72). 
Shell minute, depressed turbiniform, widely umbilicated ; aper- 
ture large, rounded. 
VALVATELLA, Gray. Shell conic; whorls rounded, with laminar 
periostraca; axis imperforate; aperture circular, peristome simple. 
V. Grenlandica, Gray. 
BATHYMOPHILA, Dall. When young umbilicated like Margarita, 
but the nearly adult has a br oad, 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. MM. euspira, Dall. W. Indies. 

? CrisospirA, Billings, 1865. 
Distr.—C. curiosa, Billings. Silur.; Canada. 
Trochiform, surface reticulated ; aperture widely expanded all 
round ina 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 WN the apex of the spire it is spirally 
coiled. 
Position uncertain; may be more nearly allied to Trochita. 
Famity STOMATELLID A. 
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, 
EARIDp Ines: S. imbricata, Lam. (xxx,.73). 8. Cumingti, A. 
Ad. (1xxxi, 74). : i 
