930 



ZOOLOGY— MOLLUSC A. 



Planorbis parallelus, Say(!), Proc. Acad. Nat. Sci. Phila,, ii, 1821, 164 — Say, Condi., 



Binney's ed., ('3. 

 Helicodiscus Uneata, Mouse, Jour. Port. Soc, i, 1864, 25, figs. 61, 62, pl.ii, f. 3; pL vni, 



f. 03. — Tyron, Am. Jour. Couch., ii, 1866, 204, pi. iv, f. 60. 



Range — throughout Eastern North America. Found also on the Rio 

 Chama, New Mexico, and in Arizona. 



No. 



Locality. 



Date. 



Collector. 



II L I 



Gila River, Ariz 



Oct., 1873 



Dr. O. Loew. 



Genus PATULA, Hald. 

 PATULA STPJGOSA, Gould. 



Helix strigosa, Gould, Proc. Post. Soc. Nat. Uist., ii, 1846, 166.— 2d., U. S. Exp. 

 Exped., Moll., 1852, 36, f, 41.— Id., Terr. Moll., ii, 210, pi. xxvi, a,— Pfelffer, 

 M011. Hel. Viv., i, 121 ; iv, 91.— Id., Mai. BL, 1857, 321.— W. G. Binney, Terr. 

 Mol., iv, 23.— Binney & Bland, Land & Fresh Water Shells N. A., pt. i, 

 1869, 72.— Binney, Bui. Mus. Comp. Zool., iii, No. 9, 192. 



Anguispira strigosa, Tryon, Aid. Jour. Conch., ii, 1866, 261, pi. iv, f. 40. 



(Helix cooperi should also probably be admitted as a synoiiiyii.) 



Binney states the range of this species : " From Rio Piedra, of West- 

 ern New Mexico, to Bighorn Mountains, Nebraska. It seems to inhabit the 

 Central Basin." And in his more recent paper he gives the following dis- 

 tribution : " This species is peculiar to the ' Central Province ', which extends 

 from Mexico to the British possessions, between the Rocky Mountains in 

 the east and the Sierra Nevada and Cascade Mountains in the west, while 

 the succeeding species, P. striatella, Anth., is more widely distributed 

 throughout the Pacific Province, which consists of a narrow strip between 

 the Sierra Nevada and Cascade Mountains in the east and the Pacific Ocean 

 in the west. Its southern limit is San Diego, from whence it extends north- 

 erly to Alaska. This latter form is abundant in the Sierra Nevada." 



Mr. Tryon informs me that, after a careful examination and comparison 

 of many specimens of this shell, he believes it identical with Helix haydenii, 

 Gabb, a variety with elevated lines, and with this experience II idahoensis 

 is probably another extreme variety of this protean form. 



Dead specimens only secured in elevated localities in Utah. 



