336 Mr. A. Adams on new Mollusca from Japan. 
quantities of fragments of dead Ophiuri, on.which it may pos- 
sibly be parasitic. 
Genus Nipnonta, 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 continuo. 
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. 
NV. testa levi, pallide fusca, nitida, spiraliter lirata; anfractibus 22, 
conyexis, ultimo liris transversis majoribus quinque et multis mi- 
noribus basalibus instructo ; regione umbilicali impressa ; peritre- 
mate margine acuto. 
Hab. Off Mino-Sima. Korea Strait; 63 fathoms. 
Genus Fineiia, A. Adams. 
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 
Rissoa, will form a member of the family Rissoide. ; 
Finella pupoides, A. Adams. 
F. testa tenui, pupoidea, imperforata, pallide fusca, fascia transversa 
rufo-fusca in medio anfractuum, in anfractu ultimo fasciis duabus ; 
anfractibus 73, 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 Mrnorra, A. Adams. 
Testa globoso-conoidea, late et profunde umbilicata; anfractibus 
rotundatis, clathratis, suturis canaliculatis; 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- 
