146 PTEROPODA. 



and discoid, to completely spiral forms in the same class, 

 seems sudden and anomalous when the animal parts are so 

 much alike. 



34. Flemingii, f. 51, Forbes anclHanley. — Ovato-ventri- 

 cosa ; anfractibus quinis rapide crescentibus, ultimo magno 

 breviusculo ; columella tortua; apertura infra obtusa. — The 

 last whorl is ventricose, but rather shortened. 



35. ARCTiCA, f. 54, Fahricius. — Ovata, leviter punctata, 

 anfractibus tribus, ultimo maximo ; columella tortua, acumi- 

 nata. — Of a more oval form than the preceding, with a more 

 produced acuminated columella and aperture. 



36. VENTRicosA, f. 52, Souleyet. — Depresso-giobosa, minu- 

 tissima ; anfractibus brevibus, ultimo depresso-ventricosa ; 

 apertma brevi, columella brevi tortuosa. 



37. CLATHRATUS, f. 55, Souleyet. — Subgloboso-depressa 

 striato-punctata ; spira minuta; columella rectiuscula brevi; 

 apertura semicirculari. — Depressed, subglobose, with punc- 

 tured striae ; spire very minute ; columella short and rather 

 straight. 



38. ROTUNDA, f. 56, Orbigny. — Depressa discoidea sub- 

 umbilicata ; spira brevi, anfractibus tribus depressis ; aper- 

 tura oblique rotunda, columella cum margine confluenti. — A 

 depressed orbicular species, with short depressed spire of few 

 whorls. 



39. Jeffreysii, f. 57, Forbes and Hanley. — S. rotundoe 

 similis, sed ultimo anfractu magis ventricosa, spira magis 

 conica, anfractibus quinis. 



40. INlACANDRiEi, f. 50, Forbes and Hanley. — Gracile fusi- 

 formis, la3vigata ; alba; spira producta ; anfractibus septenis 

 convexis obliquis ; apertura pyriformi, columella et labio 

 externo oblique tortuis. — A slender fusiform white shell, 

 with a raised spire, formed of seven oblique whorls. 



41. ArsTRALis, f. 53, Souleyet. — 8. Macandrmi similis sed 

 magis ventricosa, spira breviori, anfractibus quinis ; labio 

 externo ad medium sinuatim producto. — Shorter and broader 

 than the preceding, with a sinuous bend at the middle of 

 the outer lip. 



