PROCEEDINGS OF THE XATIONAL MUSEUM. 161 



mesa lands." The Museum is indebted to liiui for an excellent series 

 (Nos. 98930, 98931, U. S. N. M.), which includes also a dark-colored 

 variety (Xo. 98932, IT. S. N. M.). 



HELIX (POLYGYRA) BEHRI, Gabb. 



Several examples. Near Guaymas (No. 58514, U.S.N. M.); banks 

 of Yaqui River (No. 23766, U. S. N. M.), Gabb. 



A few specimens (seven or eight), all dead and bleached, though 

 otherwise perfect, were detected as above by Mr. Fisher. The species 

 was described by the late Prof. Gabb, in volume 1 of the American 

 Journal of Couchology, 1865, p. 208, from specimens collected by the 

 lamented Auguste Remond, near Guaymas, on the easterly side of the 

 Gulf of California. The specimens collected by Remond were also 

 dead, as implied by Gabb's description, wherein he says "colore 

 albo ( ?) ". When living they are probably of a pale horn color, like 

 others of this group found in the same general region. The Fisher 

 shells, though having the same number of whorls and agreeing with 

 Gabb's descriptiou, vary in diameter from 0.4!) to 0.(»7 of an inch. To 

 verify my determination, specimens were submitted to my esteemed 

 friend, the late Thomas Bland, of New York, whose kind services in 

 connection with the above and other critical West American forms, 

 are gratefully remembered and acknowledged. 



HELIX (POLYGYRA) BICRURIH, Pfoiffer. 



Ten examples. 



Gulf of California region (No. 56957, U. S. N. M.): Monterey, Mexico 

 (No. 121028, U. S. N. M.) ; Texas, at Brownsville; also at mouth of the 

 Rio Grande (Nos. 123168, 123594, U. S. N. M.), William Lloyd. 



HELIX (POLYGYRA) HIND8II, Pf.-iff.-r. 



One specimen. Near (xuaymas (No. 97974, IT. S. N. M.). 



HELIX (POLYGYRA) ACUTEDENTATA, W . G . B i n ii e y . 



Three examples. Mazatlan (Nos. 56942, 56943, TT. S. N. M), Heury 

 Edwards. 



HELIX (POLYGYRA) VENTROSULA, P f <■ i flC r . 



Several specimens. Mazatlan (Nos. 56944, 60614, (T. S. N. M.), Henry 

 Edwards. 



HELIX (POLYGYRA) PLATYGLOSSA. Pfeiffer. 



Five examples. 



Mazatlan (No. 56958, U. S. N. M.) ; City of Mexico (No. 56931, U. S. N. 

 M.) Puebla, Puebla (No. 56930, U. S. N. M.). The latter were presented 

 Proc. N. M. 94 11 



