GASTEROPODA. 
TEINOSTOMA, H. and A. Adams, 1853. 
Type, T. politum. 
Synonym, Calceolina, A. Adams. 
Shell like Rotella, with a greatly produced mouth and callus. 
It resembles Cyclops among the Nasside, and in the appear- 
ance of the base Streptaxis and Anostoma among the Helicide. 
Distribution, 9 species. Japan, Mazatlan, St. Helena, Jamaica. 
Fossil, 10 species. Eocene. Paris basin. 
ETHALIA, H. and A. Adams. 
Shell of the general aspect of Vitrinella, but agreeing with 
Rotella in haying a callous base, and differing from the typical 
species of that genus in being frequently sculptured; in the 
callus winding round, generally not covering, the umbilicus; 
and in the outside of the callus not being glossy. The lip is 
generally not reflected over the body whorl. 
They appear to retain permanently the young state of Tei- 
n0stoma. 
Distribution, 12 species, inhabiting deep water. Mazatlan, 
Jamaica, Japan. 
MOoNODONTA. 
DELPHINULA (including Collonia, Liotia, Serpularia, and 
Crossostoma). 
CYCLOSTREMA, with Adeorbis and Vitrinella as sub-genera. 
STOMATELLA, GENA, and BRODERIPIA. 
FAMILY X.—HALIOTIDZA. 
Sub-family, HALIOTINA. 
Genera—HAtiorTis (p. 268), STOMATIA (p. 268), TEINOTIS 
(p. 269). 
Sub-family, ScisSURELLIN.E. 
Genera—ScIssURELLA (p. 269), PLEUROTOMARIA (p. 270), 
(Raphistoma and Scalites are merely sections of this genus), 
MuRCHISONIA (p. 270), CATANTOSTOMA (p. 270), TROCHOTOMA 
(p. 271), with the following additional genera and sub-genera :— 
PLEUROTOMARIA (see p. 270). 
Sub-genera :—Leptomaria, Ii. Deslongchamps, 1865. LZ. 
amena, Deslong., sp. Shell like Pleurotomaria ; the respiratory 
slit is narrow and elongated. 
Distribution, Inferior oolite—Cretaceous. 
Cryptenia, E. Deslong., 1865. (Helicina, Sowerby) C. helict- 
formis, Deslong., sp. Shell of a rounded and compact form, 
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