200 HELIX §. 42. 



519. H. Vancouverensis Lea. , /<.6:5:j!^i',ulr^.?y. 



T. late umbilicata, orbiculato - depressa , soliaiuscula, minfa- 

 lissime et confertim striata et rugulosa, olivaceo-cornea; spira vix 

 elevata; anfr. 4 — 4^2 planiusculi, sensim accrescentes, ultimus 

 basi subcompressus, antice deflexus; apertura perobliqua , sub- 

 circularis; perist. superne depressum, simplex, basi incrassalum, 

 breviter reflexum, marginibus approximatis. — R. a. = 3 : 4. — 

 Diam. maj. 31 , min. 26, alt. 14 miU. (Coll. Nr. 302.) 

 Edvx Vancouverensis Lea obs. II. p. 87. t. 23. f. 72. 



— — Pfr. Symb. II. p. 4 1 . 



— — C/imw. ed. U. HelixN. 596. t. 94. f. 2 1— 23. 

 llabitat in America boreali, frequens in ripis fluvii Golumbia- 

 River, Oregon. 



520. H. Sinclairi Pfr. 



T. late umbilicata, depressa, tenuis, regulariter et confertim 

 costulato-striata , fulvo-flava, lineis rufis interruptis multifasciata ; 

 spira subplanulata; anfr. 4 planulati, sutura levi disjuncti, cele- 

 riter accrescentes, ultimus depressus, antice vaide deflexus; aper- 

 tura perobliqua, lunato-ovalis; perist. simplex, marginibus ap- 

 proximatis, dextro recto, columellari obliquo, breviter reflexo, 

 calloso. — Diam. maj. 17, min. 15, alt. 7^2 mill. (Spec. Mus. Rritt.) 



Helix Sinclairi Pfr. in Zeilschr. f. Mal. 18 45. p. 15 4. 

 Habitat in Van-Diemensland (Dr. Sinclair). 



521. H.: phmorboides Rafinesque. j(^^ 



■ '"'■'■ "■'' ' ■ ^-'■- '■'< '//•■'b 

 T. late umbilicata, depressa, superne laeviuscula, basi coslu- ' 



lato-striata, diaphana , corneo-flavida; spira brevissima; sutura 



mediocris: anfr. 5 pianiusculi, ultimus antice non deflexus; aper- 



tura vix obliqua, luuato-circularis; perist. simpiex, marginibus 



approximatis, basali reflexiusculo. — Diam. maj. 14, min. 12, 



alt. 6'/a mifl, (GoU. Nr. 303.) Alia specim. majora. 



MesompMx planorboides Bafin. (teste Fer.) 



Helix planorboides (Helicella) Fer. pr. 211. Hist. t. 82. f. 4. 



— — Pfr. Symb. II. p. 37. 



— — Chemn. ed. II. Helix N. 608. t. 95. f. 17 — 19. 



— concava Say in Philad. journ II. p. 159. 



— — Binn. in Bost. journ. III. p. 372. t. 14. 

 Circitiaria planorboides Beck md. p. 2 4. 



Habitat in America boreali: lUinois et Missouri. 



522. H. coactiliata Ferussac. . j/^ 



T. late umbilicata, depressa, subdiscoidea, lenuis, sub lente 

 minutissime granulato-striata , haud nitens , pallide cornea , fasciis 



