ALCADIA. 413 
Opere. submembranaceum, corneum. — Diam. maj. 45/, min. 4, 
alt. 3'/, mill. (Coll. Nr. 87.) 
Helicina minima Orb. Moll. Cub. I. p. 253. t. 21. f, 7—9. *) 
— —  . fÉSom. Thes. N. 17. p. 5. t. 3. f. 119. **) 
— — Chemn. ed. I.N. 33. p. 30. t, 3. £. 283—295. 
Habitat in insula Cuba! 
17. A. pusilla Adams. ;- 798 
T. depresso-globularis, fusculo- cornea, stris incrementi 
minutissimis notata; apex subacutus; spira modice elevata, 
curvilinearis; anfr. 4 convexiusculi; apertura majuscula, 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 pusilla Adams Contrib. to Coneh. N. 7. p. 101. ***) 
Habitat in insula Jamaica. 
Helicinacea ex icone solum mihi noía. 
Helicina albocincía Hombr. & Jacq. Voy. Pol Sud. Moll. 
t. I1. f. 386—939. (Ins. Arrow.) 
—  . albolabris H. & J. ibid. t. 11. f. 28 —206. (Taiti.) 
*) 'T. rotundo-depressa, laevigata, roseo-alba; spira brevi; anfr. 5 con- 
vexo-planis; apertura semilunari; labro tenui, reflexo; columella minime 
inerassata; aperturae angulo columellari dentato, emarginato. — Diam. 3!/,, 
alt. 2'/, mill. — Cette coquille nous représente en petit la forme de //4. 
dentigera, ele en a l'élévation et la bouche; néanmoins, indépendamment 
de sa taille, de moitié moindre à l'état parfait, elle s'en distingue encore 
par ses tours de spire ün peu convexes, par sa dent moins saillante, par 
son encroütement restreint et par le manque de dépression autour du péri- 
stome. (Orb. l. c.) 
**) T. minuta, 47. dentigerae simili, emarginatione minus valida. (Sow. 
Ioxes) 
***) Shell depressed globular: horn color for brownish (?): with excess- 
ively fine strae 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 vight side, some- 
what sinuate in the left side; labrum thin, moderately dilated, well reflected, 
with a deep curved incision, similar to that of HM. paíliata, and next the 
columella, the end of which is sickle-shaped. "This species is much less 
discoidal than 7. zacilenta. (Adams 1. c.) 
