Gray on Helicina. 69 



slightly and distantly, spirally striated ; beneath rather convex, 

 smooth; peristome slightly thickened, and scarcely reflected, 

 Inner lip thickened, angle of the aperture next the columella with 

 a slight notch ; axis -^^ diameter ^"^ of an inch. 



J 2. Helicina unijasciata. 



Testa subdepresso-ovata, obscure, acute carinata, albida, fusfo 

 unifasciata, spiraliter subcostata, striata ; spira convex^, conic^, 

 subtus convexa ; peristomate incrassato reflexo ; aperturae angulo 

 columellari obtuse emarginato. 



Shell rather depressed ovate, whitish, with a rather sharp 

 keel-like ridge, and narrow brown band round the centre of the 

 last whorl spirally ; rather rib-like striated, the striae convex, 

 rather distant ; spire conical convex ; beneath convex, the peris- 

 tome thickened, reflected, the columellar angle of the aperture 

 with a blunt notch ; axis -j^^, diameter -/q of an inch. 



13. Helicina Brownii. 



Testa depresso-ovata, pallide fusca, laevis, pellucida, supra con- 

 vexa, subtus convexiuscula, peristomate incrassato, reflexo albo ; 

 columella labiisque subincrassatis, albidis, aperturae angulo colu- 

 mellari fisso ; operculo antice appendiculato, corneo. 



Cochlea, n. 11. Brown Jam. t. 40, f. 1. 



West Indies, Jamaica. Brown. Mus. Brit. Sow. Nosfr. 



Shell depressed ovate, pale brown, smooth, pellucid, above convex, 

 beneath rather convex, the peristome thickened, reflected, white, 

 the columella and inner lip whitish, slightly thickened, the 

 front part of the aperture near the columellar angle with a 

 (spirally) curved slit. Operculum horny with a process fitting 

 the slit. 



This very curious shell might, at first sight, appear to form a 

 diflferent genus, but the shape of llu' aptrture of llw former 

 sections, shews that the separation would be unnecessary and 

 unnatural. 



**** Peristome rejlecteil, sinuafed ; columella callous at the base, 

 ojierculum simple. 



14. Helicina deprcssa. 



Testa depresso-ovata, pclluida, fusca, tenuissima, spiraliter ct 

 concentrice striata, supra subtusque convexiuscula ; peristomate 



