284 PYRAMIDELLIDiE. 



the simple and moderately oblique suture ; they manifestly 

 taper above, swell out rather below the middle, and incline 

 inward at their bases. The anterior slope of the subventri- 

 cose body is gradual and rounded ; its periphery is not in 

 the least angulated ; there is no umbilicus, but at most an 

 indented chink or a slight cleft. The mouth, which has a 

 moderate projection, fills nearly three-sevenths of the entire 

 length ; it is of an oblong-ovate figure, being well rounded 

 below, and gradually attenuated (not sharply contracted) 

 above. There is a decided basal recedence of the outer lip, 

 which is simple, acute, and continuously arched ; it is quite 

 smooth internally. The inner lip runs, for the most part, 

 in a straightish oblique line, and is furnished in the middle 

 with an obscure blunt retired oblique fold ; the pillar lip, 

 however, curves anteriorly, and is moderately but not 

 broadly reflected throughout. The basal diameter is about 

 two-fifths of the length; the latter is only the tenth of an 

 inch. 



The animal was not observed ; the shells were taken in 

 Zetland. 



0. RissoioEs, Hanley. 



Imperforate, tapering, extremely thin, not much shining, 

 smooth, but usually with scratch-like lines of increase ; whorls 

 merely convex, of quick increase ; penult rather high ; apex 

 blunt : reflection of the pillar lip extremely slight, if any : fold, 

 small and very retired, yet distinct. 



Plate XCVI. fig. 4, 5. 



Odustomia scalarls, Macgilliv. Moll. Aberd, p. 1.54 (copied Brit. Marine Conch. 



p. 259) ; and Brom'N, 111. Concli. G. B. p. 12.0, a,sJaminH< 



scalaris) ? 



„ JUssoiden, Hanlky, Proc. Zool. Soc. 1B44, p. 18 ; Hrit. Marine Concli. 



p. xxxvi. (f. 9, badlv). — Jei-fueys, Ann, Nat. Hist. 



new ser. vol. ii. p. 337. 



