HELIX §.18. 89 



Helix hracteola Feruss. Mus. 

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



Habitat in iiisula Maitinique (Rang). 



371. H. alveus Adams. ^* 



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

 bida, translucens, striis incrementi subtilissimis, inaequahbus; 



spira perconvexa; sutura profunda; anfr , uUimus an- 



gustus; apertura parvuhi, subquadrangularis; labrum acutum, 

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

 fractu uhimo dimidio angustior, subcyhndricus. — Diam. maj. 

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



Helix alveus Adams Contrib. to ConchoL N. 5. p. 80. 

 Habitat in insula Jamaica. 



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

 p. 67. — Chemn: ed. II. Helix N. 825. 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; umbihcus angustiusculus, 

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



Helix spreta Adams Contrib. to Conchol. N. 9. p. 173. 

 Habitat in insula Jamaica. 



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

 fini, ultimus anfr. subtus convexus fere ut in Boothiana, sed umbilicus 

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

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

 rosis et regione umbilicaii subincrassata, opaca.» 



374. H. inconspicua Adams. 



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

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

 ultimus non descendens, basi inflatus, versus umbih*cum me- 

 diocrem attenuatus, subcompressus; apertura verticahs, magna, 

 lunaris, extremitate utraque rotundata; perist. simpiex, acutum, 

 lenue. — Diam. maj. 41/3, min. 4, alt. 2 mill. (CoU. Nr. 172.) 



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

 Habitat in insula Jamaica. 



375. H. depressa Adams. 



T. umbiHcata, depressa, tenuis, striatula, vix niliduia, 



