10-1 UELIX t^. ^2(1. 



distantibus. — Diam. maj. 8, min. Ty^, alt. vix 3 mill. (Goll. 

 Nr. 137.) 



Helix perspectiva Say in Philad. jouni. I. 18 17. p. 18. 



— — (Hclicclla) Fer. pr. 198. Hist. t. 86. f. 1. 



— — Latn. ed. Dh. 213. p. 130. 



— — Binn. in Bost. journ. III. p. 430. t. 2 1. 1". 4. 



— — Cheinn. ed. II. ndix N. 53 4. t. 85. f. 30 — 32. 



— patlda Desll. in Encycl. meth. II. N. 27. 

 Euryomphala perspectiva Beck ind. p. 9. 

 Patula perspectiva Held in Isis 1837. p. 91(j. 



Ilabitat in Amcrica boreali, prope lacam Erie. 



262. H. striatella Anthony. 



T. umbilicata , orbiculato-convexiuscula , tenuissima , fusco- 

 cornea, confertim costulata; anfr. 4 vix convexiusculi, ultimus 

 basi inflatus, latiusculus; umbilicus majusculus, pcrvius; apertura 

 subcircularis; perist. simplex, acutum, marginibus approximatis. 

 — Diam. maj. 6, min. 5/2, alt. 3 mill. (CoU. Nr. 138.) 

 Helix striateUa Anth. in Bost. journ. III. p. 278. t. 3. f. 2. 



— — Binn. in Bost. journ. III. p. 432. 



— — Go2<^f/ report p. 178. f. 112. 



— — Chemn. ed. II. Helix N. 335. t. 85. f. 36 — 38. 



— perspecliva Fer. hist. t. 79. f. 7. 



llabitat in America boreali: Ohio, Massachusetts , Vermont. 



Obs. DifTort ab H. perspectiva tesla minore, convexiorc, anfractibus ma- 

 gis inaequalibus , umbilico angustiore et apertura subcirculari. An nihilominus 

 ojus varielas minor? 



263. H. Belcheri Pfr. 



T. late umbilicata, depressa, tenuis, diaphana, superne con- 

 fertim costulato-striata, subtus sublaevigata , nitida, concolor 

 cornco-cerea ; spira vix convexa; anfr. S vix convexiusculi , ulti- 

 mus basi sul)planulatus; apertura obliqua, lunato-ovalis; perist. 

 simplex, acutum. — Diam. maj. SVj, min. 7, alt. 4 mill. (Mus. 

 Cuming. ) 



Helix Belcheri Pfr. in Proc. Zool. Soc. 18 45. p. 12 8. 

 Ilabitat . . . ? (Ex itinere Belcheri.) 



263\ H. gradata Gould. -f 



T. parva, planorboidea, tenuis, nitida, rufo-viridis, luteo ra- 

 diatim variegata, supra depressa, infi^i acetabuliformis; spirae 

 anfr. 5 convexi, intra umbilicum angulati, oblique et confertim 

 striali, striis interruptis volvcntibus decussati, ultimus subangu- 

 latus. versus aperluram deflexus; sutura canaliculata; aperlura 



