410 ALCADIA. 
üuscula; anfr. fere 5 parum convexi, ultimus magnus, vix 
descendens; apertura parum obliqua, semiovalis; columella 
brevissima, verticalis, basi denticulum acutum formans, callum 
emittens tenuem, eranulosum ; perist. tenue, breviter K uU 
margine supero repando, basali ad columella emarginato. 
Opere. solidum, testaceum , rubellum. — Diam. maj. 8, min. 
61/5 alt. DU IP (Coll. N. 83.) 
Helicina succinea  Pfr. in Zeitschr. f. Malak. 1850. p. 76. 
— — rChemn;' ed. ILUN. 97.1: 30: $£.15—17. 
Habitat in insula Haiti (Salle). 
722 11. A. solitéarin Adams. 
T. depressa, tenuiuseula, sub lente subtilissime granulata, 
diaphana, straminea vel albida, infra suturam fulvo-unifasciata ; 
spira brevis, convexa; anfr. 15-40 vix convexiusculi, ultimus 
subdepressus, basi vix convexior; apertura obliqua, subtrian- 
eulari-semiovalis; columella brevis, excavata, antrorsum in 
dentieulum desinens, retrorsum in callum tenuem, semicireu- 
larem, flavescentem expansa; perist. tenue, breviter reflexum, 
margine supero repando, Mbasali incisura levi a columella 
separato. — Operc.? — Diam. maj. 8— 9, min. 6!/, — 1'/,, 
alt. 47, — 9. mill; (Goll: N84.) 
Helicina solitaria -4dams in Proc. Bost. Soc. 1845. p. 12. *) 
— . Guildingiana Pfr. im Zeitschr. f. Malak. 1848. p. 87. 
c -— Chemn. ed. Il. N-81."p.'29^ t4. f*37—'99; 
Habitat in insula Jamaica. 
723 12. A. dubiosa Adams. 
T. depressa, tenuiuscula, subtilissime striata, nitida, rubella; 
spira vix conoideo-elevata; anfr. 4 vix convexiusculi, ultimus 
basi subplanatus: apertura obliqua, semiovalis; columella sub- 
planata, triangularis, vix recedens, callum retrorsum emittens 
crassiusculum ; perist. subincrassatum, album, expansiusculum. 
— Diam. maj. 8, min. 7, alt. 5 mill. (Mus.- Cuming.) 
Helicina dubiosa .4dams Contrib. to Conchol. N. 6. p. 93. **) 
B8. Spira minus elevata, columella distinete incisa: 
Hoelicina dubiosa var. intermedia Adams ibid. p. 94. 
Habitat in insula Jamaica. 
*) 'T. depressa, rubra, fuscescente; anfr. 4!/, laevibus, ultimo nunquam 
angulato; apertura semicirculari; labio infra emarginato; columella acuta; 
labro subtenui, extra flavo; operculo tenui. — Diverg. 1159; alt. 0,22; lat. 
max. 0,35; lat. min. 0,31 poll. (Adams l. c.) 
**) Shell globose-conie: shining, reddish brown, with the hip and callus 
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