r,.30 REPORT— 18C3. 



'J. JTeh't- •tfii'i'f'^fi, Anfli. "With ff. arh»ea,J. O. C. From Piinnila E. to Kansas, 

 and tVnm iViiiljina (Red liivtr N.) to N'irLrinia; t<'sti' Jilutid. 



10. Succinea ni*ti((iiiu, Gld. '* Iiocky Mountaius of Litter lioot Vallev, 2ijOO- 



4.JU0 tt.;' J. G. C. 



The freshwater shells collected on the Rocky ^fountains hy Dr. Cooper 

 wore detennined, with the assiBtance of Dr. Lea and of Mchsrs. Binney and 

 Prime, as follows : — 



11. LimnfPa frar/ilis [&3 of\ Linn. [Binney]. Hell-Gate River; Missouri River, 



al)ove the Falls. [=i. jtaliistrin, auut.] 



12. Limncea hvmiliii, Say. IIell-( Jate River. 



l-'i. Limtuea hu/i'mnides, Linn. [Binneyl Missouri River, above the Falls. 



14. LimiKPa (le*i(/i(isa, Siiy. Missouri River, above the Falls. 



15. Phym hi/pnorum, Linn. Hell-Gate River. 



](). Phi/Mi heterodropha, Say. Hell-Gate River ; Missouri River, above the Fallfc 



17. Pinnorlm trtvoli'is, Say. HelKiate River. 



1h. Plauorbis ?parvus, Say. Hell-Gate River. 



111. Aiiqilm, sp. ind. 



20. Melanin pUcifera, Lea. Hell-Gate River. 



2 1 . LfpUi.vis, ap. ind. 



22. Amnicola, sp. ind. 



2S. Sphferium [Cf/clasl orculentaU, Prime. Hell-Gate River. 



24. Sph(erivm [Ct/clasj striatinum, Lam. Missouri River, above the Falls. 



25. Unio lidfolua, Lam. 

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



Iiiver, below Lake Cceur A'A.\^ne,=A.f<dcntus, Gld. ; the purple var. hithei-to 

 only found on the Pacific slope. 



23, 



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 Gulf 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 Glandinae and painted Buliroids of Mazatlan, and the 

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

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

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

 being given of the new species : — 



No. 



1. Heluv areolnta, Shy. Cerros Is., Dr. Veafch. 



2. Ndix Pandores,Fhs. Margarita Is. (2fm/i6y). 



.3. Btdnniis e.rcelsus, Gld. La Paz. (Mus. Cal. Acad. N. S.) 



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



suflnfiis; nom. preoc] 



5. JBidinms imllidior, iihy., = 7:effetug, Gld. With P. incendens, v. infra. (S. Ame- 



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

 C. Buhmus prof ens, Brod. One large and many youn^ specimens; Cape St. Lucas, 

 Xantiis. (Mountains of Peru, teste Pfeiffer.) [C. S. L.. no. IbZ.l 



7. Bidimus XanfuKt, n.s. Promontory of St. Lucas. 4 sp. Xantiis. [No. 168.] 



8. Bidimus artemiiia, n.s. Promontory of St. Lucas. 1 sp., on small species or 



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



9. Buiimus pihda, n.s. Todos Santos Mission and Margarita Is., in rocky spots 



under mosses, not uncommon, Xantus. Resembles B. su^atus,'}uii. [No. 170.] 

 10. Bidimtis incendens, n.s. In great numbera with B. pallidior, Sbv., climbing 



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



Lucas, MaTjiarita Bav, Xantus. Resembles B. e.rcelsus, Gld. [No. 171.] 

 IL Pedipts liratUf Binn. Cape St. Lucas, Xantus. [C. S. L.^ no. 172.] 



116 



