100 HELIX §. 20. 



249. H.('<li:afl^>Pfr. ,.. 



T. iimhilicata, subdepressa, tonuissima'; laete cornea, obli- 

 que costata; anfr. 4 convexiusculi ; apertura magna, subcircularis; 

 perist. tenue, acutum, ad umbilicura subreflexum. — Diam. maj. 

 973 , min. 8 , alt. 6 mill. ( Goll. Nr. 1 32. Spec. max.) 

 Helix fragilis Pfr. in Wiegm. Arch. 1 839. 1. p. 350. 



— — M. Icon. I. 3. p. 51. t. 3. f. 10. 



— — Chetn7i. ed. II. Helix N. 527. 1. 85. f. 10 — 12 . 

 Habitat in insula Guba, ubi prope Matanzas minus frequenlem 

 legi; Retiro, Garolina et Mt. Vernon (Gould). 



Obs. Nomen servari polesl, cum in dispositione syslemalica H. fragilis 

 Hutt. (Nr. 89.) in genere Naninae enumeranda sit. 



250. H. sincera Adams. 



T. umbilicata, depressa, tenuis, confertim costulata, cereo- 

 albida; spira plana; anfr. 4 convexiusculi , ultimus teres; umbili- 

 cus latus, perspectivus ; apertura subverticalis, lunalo-circularis ; 

 perist. simplicissimum, rectum. — Diam. maj. 3^3, min. 3, alt. 

 '1^3 mill. (Mus. Guming). 



Helix sincera Ad. in Bost. Proc. 18 45. p. 16. 



— — Pfr. Symb. III. p. 67. 

 Habitat in insula Jamaica. 



250% H. mutata Gould. f ^^ 



T. orbicularis, depressa, tenuis, cerina, mfra rotundata; 

 spirae anfr. 4 convexi, nitidi, juniores glabrati, majores supra 

 crassi-striati , subangulati; sutura impressa; subtus glabra, sulcis 

 radiantibus remotis radiatim divisa, umbilico modico perforata; 

 apertura ampla, lunata, basi subangulata; labrum simplex. — 

 Lat. Yio, alt. ysopoll. (G.) 



Helix mutata Gould 1846. Exped. shells p. 19. 

 Habitat prope Rio Janeiro Brasiliae. 



Obs. «Haud dissimilis H. alliariae. Num forsan H. insisnis Orb.?» 



251. lSi.YA6ie\\2iVtp./Jl/j.09j,/^,4,'m. ■ 



T. umbilicata, depressa, sublenticularis, teiiiiis, utrinque 

 confertim costulata, cornea, strigis crebris undatis, castaneis, ad 

 peripheriam latiorilDUS radiata; spira vix elevata; anfr. 5^2 con- 

 vexiusculi, ultimus subangulatus , basi planiusculus ; umbilicus 

 mediocris, pervius; apertura subverticalis , lata, lunaris; perist. 

 simplex, tenue. — Diam. maj. 4^4, min. 4/2, alt. ^y^ mill. (Goll. 

 Nr. 133.) 



Helix radiella Pfr. in Proc. Zool. Soc. 1845. p. 125. 



