ALCADIA. 
413 
Operc. submembranaceum, corneum. — Diam. maj. 4 3 / 4 , min. 4, 
alt. 3 '/ 3 mill. (Coll. Nr. 87.) 
Helicina minima Orb. Moll. Cub. I. p. 253. t. 21. f. 7 — 9. *) 
— — Sow. Thes. N. 17. p. 5. t. 3. f. 119. **) 
— — Chemn. ed. II. N. 33. p. 30. t. 3. f. 23 — 25. 
Habitat in insula Cuba! 
IT. A. pusilla Adams, f 728 
T. depresso - globularis , fusculo - cornea , striis incrementi 
minutissimis notata ; apex subacutus ; spira modice elevata, 
curvilinearis ; anfr. 4 convexiusculi ; apertura majuseula, latere 
dextro rotundata, sinistro subsinuata; labrum tenue, modice 
dilatatum , reflexum , incisione profunda , curvata a columella 
basi falciformi separata. Operc.? — Diverg. media 120°; 
alt. 0,16; lat. max. 0,25; lat. min. 0,2 poll. (Ad.) 
Helicina imsilla Adams Contrib. to Conch. N. 7. p. 101. ***) 
Habitat in insula Jamaica. 
Helicinacea ex icone solum mihi nofa. 
Helicina albocincta Hombr . & Jacq . Vo y. Pol Sud. Moll. 
t. 11. f. 36 — 39. (Ins. Arrow.) 
— albolabris H . & J. ibid. t. 11. f. 23 — 26. (Taiti.) 
*) T. rotundo-depressa, laevigata, roseo-alba; spira brevi; anfr. 5 con- 
vexo-planis ; apertura semilunari ; labro tenui , reflexo ; columella minime 
incrassata; aperturae angulo columellari dentato, emarginato. — Diam. 3%, 
alt. 2 */ 2 mill. — Cette coquille nous represente en petit la forme de l H. 
dentigera , elle en a l’elevation et la bouche ; neanmoins , independamment 
de sa taille, de moitie moindre a l’etat parfait, elle s’en distingue encore 
par ses tours de spire un peu convexes, par sa dent moms saillante, par 
son encroutement restreint et par le manque de depression autour du peri- 
stome. (Orb. 1. c.) 
**) T. minuta, H. dentigerae simili, emarginatione minus valida. (Sow. 
1. c.) 
***) Shell depressed globular: horn color for brownish (?) : with excess- 
ively fine striae of growth : apex subacute ; spire moderately elevated , with 
the outlines curvilinear : whorls more than four , a little convex , with a 
distinct suture : aperture rather large, well rounded in the right side, some- 
what sinuate in the left side ; labrum thin, moderately dilated, well reflected, 
with a deep curved incision , similar to that of H. 'palliala , and next the 
columella, the end of which is sickle -shaped. This species is much less 
discoidal than H. macilenta. (Adams 1. c.) 
