200 
HELIX §. 42. 
^ 519. H. Vancouvercnsis Lea. 
T. late umbilicata, orbiculato -depressa, solidiuscula, minu- 
tissime et confertim striata et rugulosa, oiivaceo-cornea; spira vix 
elevata; anfr. 4 — 4yj planiusculi, sensim accrescentes, ultimus 
basi subcompressus , antice deflexus; apertura perobliqua, sub- 
circularis; perist. supenie depressum, simplex, basi incrassatum, 
breviter reflexura , marginibus approximatis. — R. a. = 3 : 4. — 
Diam. maj. 31 , min. 26, ait. 14 mill. (Coli. Nr. 302.) 
Helix Vancouverensis Lea obs. II. p. 87. t. 23. f. 72. 
— — P[t\ Symb. II. p. 41. 
— — Chemn. ed. U. Helix N. 5 9 6 . t. 9 4 . f. 2 I — 2 3 . 
Habitat in America boreali, frequens in ripis fluvii Columbia- 
River, Oregon. 
520. H. Sinclair! Pfr. 
T. late umbilicata, depressa, tenuis, regulariter et confertim 
costulato-striata , fulvo-flava, lineis rufis interruptis raultifasciata ; 
spira subplanulata ; anfr. 4 planulali, sutura levi disjuncti, cele- 
riter accrescentes, ultimus depressus, antice valde deflexus; aper- 
tura perobliqua, lunato -ovalis; perist. simplex, marginibus ap- 
proximatis, dextro recto, columellari obliquo, breviter reflexo, 
calloso. — Diam, maj, 17, min. 15, ait. 7y2 mill. (Spec. Mus. Brilt.) 
Helkc Sinclairi Pfr. in Zeitschr. f. aial. 1845. p. 154, 
Habitat in Van-Diemensland (Dr. Sinclair ). 
521. H. planorboides Raflnesquc. 
T. late umbilicata, depressa, superne laeviuscula, basi coslu- 
lato-slriata, diaphana , corneo -flavida; spira brevissima; sutura 
mediocris; anfr. 5 planiusculi, ultimus antice non deflexus; aper- 
tura vix obliqua, lunato -circularis; perist. simplex, marginibus 
approximatis, basali reflexiusculo. — Diam. maj. 14, min. 12, 
ait. 6 /i mill. (Coli. Nr. 303.) Alia specim. majora. 
JUesomphix planorboides Pafin. (teste Fer.) 
Helkc planorboides (Helicella) F^. pr. 211. Ilist. t. 82. f. 4. 
— — Pfr. Svmb. U. p. 37. 
— — Chemn. ed. II. Helix N. 608. t. 95. f. 17-19. 
— concava Say in Philad. journ. II. p. 1 59. 
— — Binn. in Bost. journ, III. p. 372. t. 14. 
Circinaria planorboides Beck md. p. 24. 
Habitat in America boreali: Illinois et Missouri. 
y 522. H. coactiliata Fcrussac. 
T. late mnbilicata, depressa, subdiscoidea, tenuis, sub lente 
minutissime granulato-striata , liaud nitens, pallide cornea, fasciis 
