152 Mr. A. Adams on new Species of Mollusca 
posteriorly, and the angle of the outer lip is more rounded ; it 
wants, moreover, the transverse strize at each end. 
6. Cylichna lepidula, A. Adams. 
C. testa cylindracea, nivea, solida, nitida, polita, in medio vix angus- 
tata, postice truncata, spice vix perforato ; periomphalo acuto ; 
apertura lineari; labio calloso, plica valida, distincta; labro mar- 
gine inflexo. 
Hab. Tsu-Sima; 26 fathoms. 
This species differs from all others described, in the periom- 
phalus, or hind part of the body-whorl enclosing the sunken 
apex, forming an acute well-defined ridge. It is a small, white, 
highly polished, opake shell. 
7. Cylichna consobrina, A. Adams. 
C. testa cylindraceo-ovata, vix rimata, alba, solidula, longitudinaliter 
_ striata, utrinque striata, striis distantibus ; apertura angusta ; labio 
antice valde plicato ; labro subarcuato. 
Hab. Mino-Sima; 63 fathoms. 
Most like C. rimata, but is more solid, longitudinally striated, 
and wants the conspicuous umbilical fissure of that species. 
8. Cylichna parallela, A. Adams. 
C. testa cylindracea, rimata, albida, solidiuscula, utrinque striata, 
longitudinaliter strigosa; anfractu ultimo lateribus parallelis ; 
apertura lineari, antice producta ; labio callo reflexo rimam tegente; 
labro margine recto, postice producto et angulato. 
Hab. Tsu-Sima; 16 fathoms. 
Most nearly resembles C. involuta, A. Adams; but the aper- 
ture is produced and pointed anteriorly, the sides of the body- 
whorl are nearly parallel, and the outer lip forms posteriorly a 
produced angle. 
9. Cylichna assimilis, A. Adams. 
C. testa cylindracea, sordide alba, solida, breviuscula, postice truncata, 
dilatata, antice acuminata, sub lente obsolete tota transversim 
striata ; apertura lineari; labio incrassato, plica evanida; labro 
margine rectiusculo, postice subproducto et rotundato. 
Hab. Mino-Sima; 63 fathoms. 
A small specics, somewhat resembling C. involuta, A. Adams, 
but much shorter, dilated behind, narrowed in front, and with 
the hind angle of the outer lip rounded. 
