HELIX §. 18. 89 



Helix hracteola Feruss. Mus. 

 — — Desh. in Fer. hist. I. p. 84. N. 111. t. 86. f. 2. 



Habitat in insula Martinique (Rang). 



371. H. alveus Adams. ^ 



T. umbilicata, semiovalis, peripheria vix subangularis , al- 

 bida, translucens, striis incrementi subtilissimis, inaequalibus; 



spira perconvexa; sutura profunda; anfr , ullimus an- 



guslus; apertura parvula, subquadrangularis; labrum acutum, 

 tenue; labium callo distincto, tenui munitum; umbilicus an- 

 fractu ultimo dimidio angustior, subcylindricus. — Diam. maj. 

 0,3, min. 0,28, alt. 0,18 poll. (Ad.) 



Helix alveus Adatns Contrib. to Conchol. N. 5. p. 80. 

 Habitat in insula Jamaica. 



372. peraffinis Adams. (Coll. 171. — Hyalina Alb. 

 p. 67. — Chemn. ed. II. Helix N. 823. t. 129. 

 f. 34—36.) Mon. I. p. 95. 



373. H. spreta Adams. ^ 



T. orbiculata, modice depressa, pallidissime cornea, trans- 

 lucens, laevigata; spira subcurvilinearis; anfr. 5 convexi, hu- 

 merosi, sutura profundiuscula juncti , ultimus rotundatus; aper- 

 tura sublunata; labrum tenue, acutum; umbilicus angustiusculus, 

 profundus. — Lat. max. 0,25, min. 0,22, alt. 0,17". (Ad.) 



Helix spreta Adams Contiib. to Conchol. N. 9. p. 17.3. 

 Habitat in insula Jaraaica. 



Obs. «Similis H. peraffini et Boothianae; spira depressa ut in peraf- 

 fini , ultimus anfr. sublus convexus fere ut in Boothiana, scd umbilicus 

 aeque latus ac in peraffini; apertura angustior quam in peraffini, minus 

 alta quam in Boothiana. — Var. errans differt anfractibus minus liume- 

 rosis et regione umbiiicali subincrassata, opaca.» 



374. H. inconspicua Adams. 



T. umbilicata, depressa, striatula, tenuis, subhyalina; spira 

 medio vix elevata; sutura profunda; anfr. ^y^ convexiusculi, 

 ultimus non descendens, basi inflatus, versus umbilicum me- 

 diocrem attenuatus, subcompressus; apertura verticalis, magna, 

 lunaris, extremitate utraque rotundata; perist. simplex, acutura, 

 tenue. — Diam. maj. 47^, min. 4, alt. 2 mill. (Coll. Nr. 172.) 



Helix inconspicua Adams Coulrib. to Conchol. N. 3. p. 37. 

 Habitat in insula Jamaica. 



375. H. depressa Adams. 



T. umbilicata, depressa, tenuis, striatula, vix nitidula. 



