100 
HELIX §. ^20. 
240. H. fragilis Pfr. 
T. umbilicata, subclepressa, tenuissima, laete cornea, obli- 
([ue costata; anfr. 4- convexiusculi ; apertura magna, subcircularis; 
perist. tenue, acutum, ad umbilicum subreflexum. — Diam. maj. 
0y3, rain. 8, ait. 6 mill. (Coli. Nr. 132. Spec. max.) 
Hdxx fragilis Pfr, in Wiegm. Arch. 1839. I. p. 350. 
— — PhiL Icon. I. 3. p. 51. t. 3. f. 10. 
— — Chexmi. ed. U. IlelLx N. 327. t. 85. f. 10—12. 
Habitat in insula Cuba, ubi prope Matanzas minus frequentem 
legi; Retiro, Carolina et Mt. Yernon (Gould). 
Obs. Nomen servari polest, cum in disposilione syslemalica U, fragilis 
Hult (Nr. 89.) in genere Naninae enumeranda sit. 
‘250. H. sincera Adams. 
T. umbilicata, depressa, tenuis, confertim costulata, cerco- 
albida; spira plana; anfr. 4 convexiusculi, ultimus teres; umbili- 
cus latus, perspectivus; apertura sub verticalis, lunato-circularis ; 
perist. simplicissimum, rectum. — Diam. maj. 3'/3, min. 3, ait. 
'iy3 mill. (Mus. Cuming). 
Helix sincera Ad. in Bosl. Proc. 1845. p. 16.'' 
— — Pfr. Svmb. UL p. 67. 
Habitat in insula Jamaica. 
250^. H. mutata Gould. 
T. orbicularis, depressa, tenuis, cerina, infra rotundata; 
spirae anfr. 4 convexi, nitidi, juniores glabrati, majores supra 
crassi-striali , subangulati; sutura impressa; subtus glabra, sulcis 
radiantibus remotis radiatim divisa, umbilico modico perforata; 
apertura ampla, lunata, basi subangulata; labrum simplex. — 
Lat. yio, ait. yao poll. (G.) 
, Helix mutata Gould 1 8 46. Exped. shells p. 19. 
^ Habitat prope Rio Janeirb Brasiliae. 
Obs. «Haud dissimilis H. alliariao. Num forsan H. insignis Orb. ?» 
^ 251^ H. radiella PtV. 
T. umbilicata, depressa, sublenticularis, tenuis, utrin([ue 
confertim costulata, cornea, strigis crebris undatis, castaneis, ad 
peripberiam latioribus radiata; spira vix elevata; anfr. con- 
vexiusculi, ultimus subangulatus , basi planiusculus; umbilicus 
mediocris, pervius; apertura sul^verticalis, lata, lunaris; perist. 
simplex, tenue. — Diam. maj. 4%, min. 4 / 2 , ait. 2^/2 mill. (Coli. 
Nr. 4 33.) 
Helix radiella Pfr, in Proc. Zool. Soc. 1845. p. 125. 
