102 IIELIX §. 20. 



mcllari dilalalo, patenlc. — Diam. maj. 30, min. 26, all. 16 mill. 

 (Mus. Cuining. ) 



flelix Kochi Pfr. in Proc. Zool. Soc. 184.H. p. 127. 

 Habitat . . . ? 



255. H. solitaria Say. 



T. late pervio-umbilicata, globoso-depressa , solidiuscula, 

 diaphana, oblique confertim rugosa, lutescenti-cornea , brunneo 

 2 — Sfasciala; anfr. 6 convexi; sutura profunda; apertura lunato- 

 rotundata, intus nitide alba, fasciata; perist. simplex, acutum, 

 margine columellari dilatato, subreflexo. — Diam. maj. 25, min. 

 22, alt. 15 mill. (GoII. Nr. 135.) 



Helix solitaria Say in Philad. joiirn. 11. p. 1 57. 



— — Binn. in Bost. journ. III. p. 426. t. 23. 



— — Pfr. Symb. II. p. 39. 



— — Chemn. od. II. Helix N. 145. f. 24. f. 5. 6. 

 Euryomphala solitaria Beck ind. p. 8. 



llabitat in America boreali : Missouri , Ohio. 



256. H. alternata Say. 



T. late umbilicata, orbiculato-depressa , tenuis, luteo-cornea, 

 slrigis interruptis, rufis ornata, striis confertis elevatis scabra; 

 anfr. 0/2 planiusculi, ultinms interdum obtuse carinatus; umbiH- 

 cus magnus, pervius; apertura perobliqua, lunato-ovalis ; perist. 

 simplex, acutum, ad umbilicum vix expansum. — Diam. maj. 21, 

 min. 19, alt. 10 mill. (Coll. Nr. 136.) 



Ilelix alternata Say inPhilad. journ. II. p. 161. 



— — Say in Nichols. Am. Enc. t. I. f. 2. 



— — (HeliccUa) Fer. pr. 199. Hlst. t. 79. f. 8. 9. 



— — Binn. in Bost. journ. III. p. 428. t. 25. 



— — Goiild veport ]). 177. f. H 4. 



_ _ Chemn. ed. II. Helix N. 146. t. 24. f. 17. 18. 



— scabra Lam. 83. p. 88. ed. Dh. p. 66. 



— radiata Gmel. 73. p. 3674? 

 Patula alternata Ileld in Isis 1837. p. 916. 

 Euryomphala alternata Beck ind. p. 8. 

 Lister t. 70. f. 69? (An potius H. solitaria?) 



/^? Carinata, junior? Fer. t. 79. f. 10. 



Ilabitat in America boreali in ripis fluviorum Mississippi, Missouri 



vl Ohio; Massachusetts (Gould). 



257. H. discoides Lesson. -^ 



T. discoidea, latc umbilicata, fusco-rubra, fasciis albis 

 minutissimis et regularibus ornata; anfr. angustissimi, ultimus 



