412 
ALCADIA. 
726 15. A. hispida Pfr. 
T. globuloso-depressa, tennis, rufa, pilis brevibus confer- 
tis hispida; spira vix elevata, subacuminata; anfr. 4 f / 2 con- 
vexiusculi, sensim accrescentes , ultimus basi convexiusculus; 
apertura parum obliqua, semiovalis; columella brevissima, basi 
in dentem recurvatum, liberum terminata; perist. subsimplex, 
vix expansiusculum, intus album, margine supero sinuoso, ba- 
sali a dente columellari incisura acuta separato; callus basalis 
tenuissimus. — Operc. submembranaceum, corneum. — Diam. 
maj. 6, min. 5'/ 4 , alt. 4 mill. (Coll. Nr. 86.) 
Helicina hispida Pfr. in Wiegm. Arch. f. Naturg. 1839. I. p. 355. 
— — Sow. Thes. N. 16. p. 4. t. 3. f. 112. 113. * *) 
— — Chemn. ed II. N. 32. p. 30. t. 3. f. 19 — 23. 
— dentigera Orb. Moll. Cub. I p. 252. t. 21. f. 4 — 6. **) 
— — Sow. Thes. N. 15. p. 4. t. 3. f. 107. 108. ***) 
Habitat in insula Cuba, frequentissima circa Matanzas! 
727 16. A. minima Orbigny* 
T. depressa, striatula, pilis brevissimis deciduis hispidula, 
fusco-rubella ; spira brevis, conoidea; anfr. 4 ‘/ 2 vix convexius- 
culi, sensim accrescentes, ultimus subdepressus , basi subpla- 
nus; apertura obliqua, semiovalis; columella brevis, subverti- 
calis, basi in dentem brevem, obtusum terminata ; perist. simplex, 
vix expansiusculum, margine basali substricto, a dente colu- 
mellari incisura levi separato; callus basalis tenuissimus. — 
brown; epidermis extremely thin, microscopically hirsute or chagrined; spire 
a little elevated and convex; whorls nearly four and one-half, scarcely con- 
vex; aperture large ; labrum thin, sharp, moderately expanded and reflected, 
with a deep curved incision below the columella similar to that of H, pal- 
liala; the produced columella is strongly margined on the inner side. — 
Mean divergence about 135° ; length 0,16; greatest breadth 0,29; least 
breadth 0,23 inch. (Adams 1. c.) 
*) T. globuloso-depressa, tenui, rufa, hispida; anfr. 4 convexiusculis ; 
callo columellari tenui; angulo columellari dentem efformante; labro cras- 
siusculo, juxta dextram acute inciso; apertura semilunari. (Sow. 1. c.) 
**) T. rotundo- depressa, laevigata, alba, fascia cincta; spira brevi, 
obtusa, inflata; anfr. 5 planis ; apertura semilunari; labro crasso, reflexo; 
columella incrassata ; aperturae angulo columellari dentato , emarginato. — 
Diam. 7, alt. 5 mill. — Gette espece assez voisine de V H. rotunda , s’en 
distingue par sa spire moins elevee, plus obtuse, par son peristome plus 
reflechi et par la forte dent de la partie columellaire. (Orb. 1. c.) 
***) T. globosa sub-depressa, alba, labio externo paululum reflexo prope 
columellam emarginato ; labio interno tenui ; columella producta , acuta, 
dentem efformante. (Sow. 1. c.) 
