154 Mr. A. Adams on new Species of Mollusca 
dilatata; labio plica obliqua conspicua; labro margine vix ar- 
cuato. 
Hab. Mino-Sima; 63 fathoms. 
In the obtuse subtruncate spire and papillary apex, this spe- 
cies resembles 7. pusilla, Pfeiff.; but it is longer and more 
slender, and the aperture is more produced anteriorly. 
2. Tornatina succincta, A. Adams. 
T. testa cylindracea, in medio coarctata, vertice truncato, alba, longi- 
tudinaliter tota striata, transversim fasciata, fasciis pallidis sub- 
distantibus ; apertura lineari, in medio angustata, antice dilatata ; 
labio obsolete plicato. 
Hab, Tsu-Sima; 16 fathoms: Awa-Sima; low water, 
In form this species most resembles 7. truncata, J. Adams ; 
but it is more elongated and much narrower, and marked with 
indistinct pale bands; the whorls of the spire are visible, but 
sunken, and the parietal plica is not conspicuous, 
Genus Vorvua, A. Adams. 
The animal of this little genus, described by me in 1850, but 
which is not generally known to conchologists, has hitherto 
eluded our researches. The shells are only obtained by deep- 
water dredging, but, judging from their form, sculpture, colour, 
and texture, appear to belong to the family Cylichnide. During 
the voyage, I have obtained all the species hitherto described, 
including V. mucronata, Phil., and V. angustata, A. Adams, 
from the China Sea, and V. striatula, eburnea, and rostrata, A. 
Adams, from the Sea of Japan. V. acuminata, Brug., the type 
of the genus, is called an Ovulum by Hanley, and is an inhabitant 
of the British seas. I now give brief diagnoses of six new 
species. 
1. Volwula opalina, A. Adams. 
V. testa elongato-ovali, rimata, alba, semipellucida, leevi, nitida, an- 
tice obsolete transversim striata, mucrone brevi in angulo pro- 
ducto labri incluso; apertura angusta; labio tenui, obliquo, in- 
curvato ; labro regulariter arcuato. 
Hab. Mino-Sima; 63 fathoms, 
2. Volvula spectabilis, A. Adams. 
V. testa elongato-ovali, postice acuminata, antice rotundata, mucrone 
brevi non producto, tenuicula, alba, nitida, minutissime trans- 
versim striata; apertura mediocri; labio tenui, elongato, vix flexu- 
oso; labro regulariter arcuato. 
Hab. Tabu-Sima; 25 fathoms. 
