630 REPORT— 1863. 



■So. 

 9. Helix sinatella, Antt. "With H. arborea, J. G. C. From Canada E. to Kansas, 

 and ii'om Pembina (Red River N.) to Virginia ; teate Bland. 



10. Sticcinea rusticana, Gld. " Roclsy Mountains of Bitter Root Valley, 2.500- 



4500 ft./' J. o. a 



The freshwater shells coUeoted on the Eocky Mountains by Dr. Cooper 

 were determined, with the assistance of Dr. Lea and of Messrs. Binney and 

 Prime, as follows : — 



11. Limncea fragilis [as of] Linn. [Binney]. Hell-Gate River ; Missouri River, 



above the Falls. \_^=L. pahistris, WLCt.'\ 



12. Limneea humilis, Say. Hell-Gate River. 



13. LimncBa bulimoides, Linn. [Bianeyl Missouri River, above the Falls. 



14. Limtusa desidiosa, Say. Missouri River, above the Falls. 



15. Physa hypnm-um, Linn. Hell-Gate River. 



16. Physa heterostropha, Say. Hell-Gate River ; Missouri River, above the Fall* 



17. Planorhis trivolms, Say. Hell-Gate River. 



18. Planorlis ?parvus, Say. Hell-Gate River. 



19. Ancylus, sp. ind. 



20. Melania plicifera, Lea. Hell-Gate River. 



21. Leptoxis, sp. ind. 



22. Amnicola, sp. ind. 



20. Siihcerimn [Cyclas] occidentale, Prime. Hell-Gate River. 



24. Spkcenam [ Cyclas] striatinum, Lam. Missouri River, above the Falls. 



25. Unio luteolus, Lam. 



26. Margaritana inargaritifera, Linn. Missouri River, above the Falls ; also Spokan 



River, below Lake Coeur d'Alene,=j4./flfc«iMS, Gld. ; the purple var. hitherto 

 only found on the Pacific slope. 



109. The land-shells of the peninsula of California present points of great 

 interest to the student of geographical distribution. While those of the 

 eastern shore of the GuK belong exclusively to the Mexican or Central Ame- 

 rican fauna, those of the western present in their general features that form 

 of the South American type which belongs to the region of the Andes. The 

 contrast between the Glandinse and painted Bulimids of Mazatlan, and the 

 small dull forms, or solid white shells of the peninsula, is evident even to the 

 superficial observer. They are catalogued by Mr. Binney in the ' Proo. Ac. 

 Nat. Sc. Philadelphia,' 1861, pp. 331-333, and are as follows, outline-figures 

 being given, of the new species ; — 



So. 



1. Helix areolata, Shy. Cerros Is., JDr. Veatch. 



2. Helix Pandor<B, Fbs. Margarita Is. {Binney). 



.3. Bulimiis excehus, Gld. La Paz. (Mus. Cal. Acad. N. S.) 



4. Bulimits vesicalis, Gld. Lower California. [Altered in ' Otia,' p. 184, to B, 



sufflatiis ; nom. preoc] 



5. Bulimns pallidior,Shj., = vegettts,G\d.. With ^. M!0(;nf?e»s, v. inira. (S.Ame- 



rica, Cuming.) [Cape St. Lucas List, no. 166.] 



6. JCtdimus proteus, Brod. One large and many young specimens ; Cape St. Lucas, 



Xanims. (Mountains of Peru, teste j^et^ej-.) [C. S. L., no. 167.] 



7. Bidimus Xaniusiiii.a. Promontory of St. Lucas. 4 sp. Xantus. [No. 168.] 



8. Bulimus artemisia, n.s. Promontory of St. Lucas. 1 sp., on small species of 



Artemisia; Xantus, [0. S. L., no. 169.] 



9. Bulimus pilula, n.s. Todos Santos Mission and Margarita Is., in rocky spots 



under mosses, not uncommon, Xantus. Resembles .B. siifflatus,\v.-n. [No. 170.] 



10. Bulimus incendens, n.s. In great numbers with B. pallidior, Shy., climbing- 



high " copal " or copaiva trees, on dry hills 800-1000 ft. high ; Cape St. 

 Lucas, Margarita Bay, Xantns. Resembles B. exeelsvs, Gld. [No. 171.] 



11. Pedipes lirata, Binn. Cape St. Lucas, Xantus. [C. S. L., no. 172.] 



116 



