90 HELIX §. 18. 



diaphana, albida; spira parum elevata; anfr. 47^ — 5 vix con- 

 vexiusculi, ultimus non descendens, peripheria subangulatus, 

 basi parum convexus, sensim in umbilicum Jatiusculum abiens; 

 apertura obliqua, rotundato-lunaris; perist. simplex, tenue, 

 marginibus conniventibus. — Diam. maj. Sy^, min. 5, alt. % 

 mill. (Mus. Cuming.) 



Helix depressa Adams in Proc. Bost. Soc. 1843. p. 16. 

 — turbiniformis P? Pfr. Monogr. I. p. 50. 

 Habitat in insula Jamaica. 



376. H. sincera Adams. 



T. umbilicata, depressa, tenuis, striatula, cereo-albida; 

 spira subplana; anfr. 47^ convexiusculi , uitimus teres; um- 

 bilicus mediocris, perspectivus; apertura subverticalis, lunato- 

 circularis; perist. simphcissimum, rectum. — Diam. maj. 4, 

 min. 3^/3, alt. 2 mill. (Mus. Cuming.) 



Helix sincera Adams, Pfr. Monogr. I. p. 100. N. 250. 

 Habitat in insula Jamaica. 



Obs. Helici inconspicuae Ad. persimilis, forma aperturae praecipue 

 discrepans. 



* 



377. pellucida Adams. ^ Mon. I. p. 96. 



378. pura Alder. (Coll. 173. — Chemn. ed. nov. II. 



p. 98. — Hyalina Alb. p. 66.) - - - 96. 



379. H. brevis Adams. 



T. anguste umbilicata, depressa, subdiscoidea, tenuis, 

 Jaevigata, nitida, aibida ; spira vix convexa; anfr. 4^^ planius- 

 culi, lente accrescentes, ultimus non descendens, depressus, 

 basi subplanulatus ; apertura subverticalis, lunato-ovalis; perist. 

 simplex, tenue, acutum. — Diam. maj. 3^4 , min. 3^4, alt. 2 

 mill. (Mus. Cuming.) 



Helix brevis Adams Contrib. to Gonchol. N. 3. p. 35. 

 Habitat in insula Jamaica. 



Obs. Differt a praecedente umbiiico angustiore, anfractibus magis 

 aequalibus , etc. 



* 



380. pauxillus Gould. f (Exped. shells 1851. p. 40. 



f. 46. — H. pusillus Gould oiim.) Mon. I. p. 97. 



381. parvula Rang. f - - - 97 



382. minuscula Binn. (Coll. 174. — Chemn. ed. nov. 



II. p. 112. — Hyaiina Alb. p. 67.) - - - 114. 



Obs. Occurrit var. dimidio minor in insuiis Cuba ct Jamaica: 



