FAMILY PURPURIC — ROSTELLARIA. 151 



(EXTRALIMITAL.) 



Genus Rostellaria, Lam. Animal imperfectly known, but, according to Cuvier, resembling that 



of Murex. Shell turreted : spire long, pointed ; aperture long and narrow, ending in a 



straight canal in front, and in a channel running up the spire posteriorly; lip widely dilated, 



often with one or more processes. 



R. occidentalis. (Guerin, Mag. Zool. 1836, pi. 72. Gould, Op. cit. p. 298. Pl. 8, fig. 177 of 



this work.) Whorls 8 -9, convex, with numerous waving vertical folds and regular conspicuous 



revolving lines : lip expanded, with a blunt process above. Color : epidermis thick and dusky ; 



beneath bluish white. Length, 2-25 ; width, 1 «5. Stomachs of fishes, and shores of Maine. 



FAMILY CONIDjE. 



Animal not furnished with a veil, but with a trunk ; having the eyes either upon or towards the sum- 

 mits of the tentacles : opercle horny. Marine. Shell variable in form, but always in the shape 

 of a cone, more or less elongated. 



Genus Conus, Linn. Animal elongated, much compressed and involuted, with a very distinct head, 

 terminating in a trunk susceptible of great extension : tongue armed with two series of sharp 

 teeth. Foot oval, somewhat lengthened, larger in front, with an anterior transverse furrow. 

 Mantle narrow, and forming an elongated siphon in front. Opercle horny, small, subspiral. 

 Shell thick, solid, conical : aperture long, narrow, linear, entire; lip simple, trenchant; pillar- 

 lip smooth. 



Obs. These are for the most part inhabitants of the equatorial seas ; and of the one hundred 

 and eighty described by Lamarck, none have been found on the coast of the United States, 

 except on the Florida Keys. 

 C. mus. (Lam. An. sans vert. Vol. 7, p. 457.) Shell ovate, turbinate, coronate, with elevated trans- 

 verse striae; spire acute. Ash-colored, banded with white, with longitudinal fulvous blotches. 

 Length, 1 *0. Florida Keys. 

 C. leucostrictus, Gmel. 



FAMILY M1TR1ADM. 



Animal with conical subulate tentacles, with the eyes on the external side, either near the base or on 

 the middle portion. Marine. Slell oblong, more or less elongated : aperture narrow, and more 

 or less emarginate. Opercle, in one genus, horny. 



Genus Terebra, Brug. Animal: head bordered with a small fringe ; tentacles approximated, cylin- 

 drical, with the eyes at the outer base ; mouth with no trunk ; foot oval, with an anterior 

 transverse furrow and two lateral processes ; siphon much elongated. 



