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 ft of an inch. 

 12. Helicina unifasciata. 



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

 unifasciata, spiraliter subcostata, striata ; spira convex^, conica\, 

 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 T ^, diameter T 6 ^ 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 appendicular, corneo. 

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

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

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

 beneath rather convex, the peristome thickeued, 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 

 different genus, but the shape of the aperture of the former 

 sections, shews that the separation would be unnecessary and 

 unnatural. 

 **** Peristome reflected, sinuated ; columella callous at the base, 



operculum simple. 



1 4. Helicina depressa. 



Testa depresso-ovata, pelluida, fusca, tenuissima, spiraliter et 

 concentrice striata, supra subtusque convexiuscula ; peristomate 



