410 
ALCADIA. 
tiuscula ; anfr. fere 5 parum convexi , ultimus magnus , vix 
descendens; apertura parum obliqua, semiovalis; columella 
brevissima, verticalis, basi denticulum acutum formans, callum 
emittens tenuem, granulosum ; perist. tenue, breviter expansum, 
margine supero repando, basali ad columellam emarginato. — 
Operc. solidum, testaceum, rubellum. — Diam. maj. 8, min. 
6'/,, alt. 5'/ s mill. (Coll. N. 83.) 
Helicina succinca Pfr. in Zeitschr. f. Malak. 1850. p. 76. 
— — Chemris eel. II. N. 97. t. 10. f. 15 — 17. 
Habitat in insula Haiti (Salle). 
722 11. A. solitaria Adams* 
T. depressa, tenuiuscula, sub lente subtilissime granulata, 
diaphana, straminea vel albida, infra suturam fulvo-unifasciata; 
spira brevis, convexa; anfr. 4 — 4*/ 2 vix convexiusculi, ultimus 
subdepressus, basi vix convexior; apertura obliqua, subtrian- 
gulari - semiovalis ; columella brevis, excavata, antrorsum in 
denticulum desinens, retrorsum in callum tenuem, semicircu- 
larem, flavescentem expansa; perist. tenue, breviter rellexum, 
margine supero repando , basali incisura levi a columella 
separato. — Operc.? — Diam. maj. 8 — 9, min. 6V 2 — 7 ! / 2 , 
alt. 4'/ 2 — 5 mill. (Coll. Nr. 84.) 
Helicina solxtaria Adams in Proc. Bost. Soc. 1845. p. 12. *) 
— Guildingiana Pfr. in Zeitschr. f. Malak. 1848. p. 87. 
— — Chemn. ed. II. N. 31. p. 29. t. 4. f. 37—39. 
Habitat in insula Jamaica. 
723 t2. 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 Adams Contrib. to Conchol. N. 6. p. 93. **) 
/5. Spira minus elevata, columella distincte incisa : 
Helicina dubiosa var . intermedia Adams ibid. p. 94. 
Habitat in insula Jamaica. 
*) T. depressa, rubra, fuscescente; anfr. 4 l / 2 laevibus, ultimo nunquam 
angulato ; apertura semicirculari ; labio infra emarginato ; columella acuta ; 
labro subtenui, extra flavo ; operculo tenui. — Diverg. 115°; alt. 0,22; lat. 
max. 0,35 ; lat. min. 0,31 poll. (Adams 1. c ) 
**) Shell globose-conic : shining, reddish brown, with the lip and callus 
