805 



ultimo eloTigato ; apertura angulata, supra acutissima ; labro acuto ; 

 columella robusta, subrecta. 



Shell chalcedouic white, with an opaque, and another less 

 opaque, spiral band at the upper part of the whorls, and with two 

 minute brown spots on the outer lip. 



Panama. (Mus. Cuming.) 



Genus OBELISCUS, Humphrey. 



Animal as in Pyramidella. 



Operculum horny, ovate ; inner edge sinuated. 



Shell subulate, turreted, many-whorled, smooth ; spire pointed, 

 nucleus sinistral ; aperture semi-oval, entire and rounded ante- 

 riorly ; columella plicated ; outer lip acute. 



This genus differs from Pyram'ulella in the whorls being smooth 

 and not longitudinally plicate ; the shells, moreover, are subulate, 

 and of a porcellanous structure, and the columella is somewhat 

 straight. 



1. Obeltscus dolabratus (pi. clxxi. f. 1, 2, 3), Liunmis 

 (Trochus), Gmel. p. 3585. no. 113. Helix dolabrata, Mull. 

 Verm. p. 121. no. 318. Bulimus dolabratus, Bmg. Diet. no. 99. 

 Pyramidella terebellum, Encycl. pi. 452. f. 2. Pjramidella dola- 

 brata, Lam. ed. Desh. vol. iv. p. 55. 



O. testa conico-turrita, perforata, lsevi, alba, lineis luteis cincta ; 

 columella recurva ; labro intus dentato et sulcato. 



Turreted, umbilicated, smooth, white, encircled with yellowish 

 transverse bands ; the whorls are more convex than in 0. terebel- 

 lum, and the outer lip is strongly grooved internally. 



"West Indies. (Mus. Cuming.) 



2. Obeliscus terebellum (pi. clxxi. f. 5, G), Mutter (He- 

 lix), Verm. p. 123. no. 319. Bulimus terebellum, Bmg. Diet, 

 no. 98. Trochus dolabratus (var.), Gmel., p. 358G. Trochus 

 terebellum; Billw., Cat. no. 119. 



0. testa conico-turrita, umbilicata, lsevi, alba, lineis runs cincta ; 

 columella recurva ; labro intus hevigato. 



Turreted, subulate, smooth, white, with transverse, reddish- 

 brown zones, usually three on each whorl, and four on the last 

 whorl ; aperture oval, entire in front • columella with three ante- 

 rior plaits. 



West Indian Islands. (Mus. Cuming.) 



