GASTEROPODA. 



Teinostoma, H. and A. Adams, 1853. 



Type, T. politum. 

 Syiionyni, Calceolina, A. Adams. 



Shell like Rotella, with a greatly produced mouth and callus. 

 It resembles Cyclops among the Nassidce, and in the appear- 

 ance of the base Streptaxis and Anosfoma among the Helicidce. 

 Distrilution, 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 oyer the body whorl. 



They appear to retain permanently the young state of Tei- 

 nostoma. 



Distribution, 12 species, inhabiting deep water. Mazatlan, 

 Jamaica, Japan. 



MOK^ODONTA. 



Delphintla (including Collonia, Liotia, Serpidaria, and 

 Crossostoma). 

 Cyclosteema, with Adeorhis and Vitrinella as sub-genera. 

 Stomatella, GrENA, and Brodeeipia. 



Family X. — Haliotid^. 



Sub-family, HALiOTiNiE. 



Genera — Haliotis (p. 268), Stomatia (p. 268), Teinoti& 

 (p. 269). 



Sub-family, Scisstjeellin.?;. 



Genera — Scissueella (p. 269), Pleueotomaeia (p. 270), 

 {Raphistoma and Scalites are merely sections of this genus), 

 MuECHisoNiA (p. 270), Catajs'tostoma (p. 270), Tegchgtoma 

 (p. 271), with the following additional genera and sub-genera : — 



Pleueotomaeia (see p. 270). 



Sub-genera : — Leptomaria, E. Deslongchamps, 1865. L. 

 amoena, Deslong., sp. Shell like Pleurotomaria ; the respiratory 

 slit is narrow and elongated. 



Distribution, Inferior oolite — Cretaceous. 



Cryptoenia, E. Deslong., 1865. {Helicina, Sowerby) C. helici- 

 formis, Deslong., sp. Shell of a rounded and compact form, 



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