90 HELIX §. 18. 



diaphana, albida; spira parum elevala; anfr. iV^ — 5 vix cou- 

 vexiusculi, ultimus non descendens, peripheria subangulatus, 

 basi parum convexus, sensim in umbilicum latiusculurn abiens; 

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

 marginibus conniventibus. — Diain. maj. Sy^; 'iiin- •'^, ^'t- "2 

 mill. (Mus. Cuming.) 



Ilelix depressa Adams in Proc. Bost. Soc. 1845. p. 16. 

 — turbiniformis ^? Pfr. Monogr. I. j). -50. 

 liabitat in insula Jamaica. 



376. H. sincera Adams. 



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

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

 bilicus mediocris, perspectivus; apertura subverticalis, lunato- 

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

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



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

 Mabitat in insula Jainaica. 



Obs. Helici inconspicnae Ad. persiiniiis, fornifi aperturne praccipui- 

 cliscrepans. 



* 



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



378. pura Aldcr. (Coll. 173. — Cliemn. ed. nov. II. 



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



379. H. brcvis Adams. 



T. anguste umbilicata, depressa, subdiscoidea, lenuis, 

 laevigata, nitida, albida ; spira vix convexa; aiifr. 4^2 planius- 

 culi, lente accrescentes, ullimus non descendens, depressus, 

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

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

 mill. (Mus. Cuining.) 



Ilelix brevis Adams Contrib. to Conchol. N. 3. p. 35. 

 llabitat in insula Jamaica. 



Obs. Differt a praecedenle umbilico angustiore, anlVactibus inagis 

 aequalibus . etc. 



* 



380. pauxillus Gould. •{• (Exped. shells 1851. p. 40. 



f. 46. — U. pusiUns Gonld olim.) Mon. I. p. 97. 



381. parvula Rang. -^ - - - 97 



382. minuscula Binn. (lloll. -174. — Cliemn. ed. nov. 



II. p. M2. — Hyalina Alb. p. 67.) - - - iH. 



Obs. Occurrit var. diuiidio niiiior in insuiis ("uba ct Jamaica : 



