336 Mr. A. Adams on new Mollusca from Japan. 



quantities of fragments of dead Ophiuri, on which it may pos- 

 sibly be parasitic. 



Genus Niphonia, A. Adams. 



Testa depresso-globosa, tenuis, imperforata; anfractibus rapide ac- 

 crescentibus. Apertura ampla, circularis ; peritremate duplicato, 

 externo tenui, acuto, in anfractum ultimum ascendente, interno in- 

 crassato, in labrum intus continue 



This little genus most nearly resembles Stomatella ; but the 

 shell is very thin, and the aperture has an internal ledge, as if 

 for the operculum. Two specimens only were obtained, both 

 dead, and both wanting the opercula. 



Niphonia pulchella, A. Adams. 



N. testa lsevi, pallide fusca, nitida, spiraliter lirata ; anfractibus 2|, 

 convexis, ultimo liris transversis majoribus quinque et multis mi- 

 noribus basalibus instructo ; regione umbilicali impressa ; peritre- 

 mate margine acuto. 



Hah. Off Mino-Sima. Korea Strait; 63 fathoms. 



Genus Fxnella, A. Adams. ^^tP^ 



Testa tenuis, pupoidea, imperforata, in medio tumida ; anfractibus 

 transversim liratis, longitudinaliter plicatis, ultimo simplici. Aper- 

 tura ovali, peritremate interrupto ; labro simplici, acuto, non re- 

 flexo aut incrassato. 



This genus, which is founded upon a small shell allied to 

 Rissoaj will form a member of the family Rissoida. 



Finella pupoides, A. Adams. 



- F. testa tenui, pupoidea, imperforata, pallide fusca, fascia transversa 



\ ,2$ 3*3 rufo-fusca in medio anfractuum, in anfractu ultimo fasciis duabus ; 



anfractibus 7i, convexis, transversim liratis, anfractibus supremis 



longitudinaliter plicatis, in medio subangulatis, ultimo simplici; 



apertura ovali ; labro margine acuto, recto. 



Hab. Tsu-Sima ; 26 fathoms. Korea Strait ; 46 fathoms. 



Genus Minolia, A. Adams. 



Testa globoso-conoidea, late et profunde umbilicata; anfractibus 

 rotundatis, clathratis, suturis canaliculars ; anfractu ultimo ad 

 aperturam subsoluto ; umbilico perspectivo. Apertura circularis, 

 intus margaritacea ; peritremate continuo ; margine recto, tenui, 

 acuto. 



Minolia is very like Torinia in form and sculpture ; but the 

 aperture is pearly within. It also resembles in form some 

 southern species of Margarita ; but the texture, markings, and 

 sculpture of the shell are different. In sculpture also it resem- 



