EASTERN PROVINCK SOUTHERN REGION SPECIES. 397 



were sent me by Mr. Machire ; but from what particular locality I 

 know not, (Say.) 



Jiulimus alternalus, Say, New Harmony Diss., Dec. 30, 1630; Descr., 25; ed. Binnet, 



39.— Pfeiffek, Mon. Hel. Viv., ii, 221.— W. G. Bixney, Terr. Moll., iv, 126, 



pi. Ixxs, figs. 1, 3, 18 ; L. & Fr.-W. Sh., i, 200 (1869). 

 BnUmus f7ea/6a/«s, Bixxey, part, Terr. Moll., ii,276, pi. li, a, upper and lower fig., pi. 



li, &.— Not Say. 

 i^K/n«»s .l/arifT, Albers, Helicecn, 162.— Pfkiffer, Proc. Zool. Soc, 1858, 23 ; Mon. 



Hel. Viv., iii, 350; in Chemnitz, cd. 2, 157, pi. xlviii, tigs. 7,8. — W. G. BiN- 



NEY,Terr. Moll., iv, 128. 

 BuUnuix IHnneiimms, W. G. Binney, Terr. Moll., iv, 128.— Not Pfeiffer. 

 Tliaiimosliis aJleniaiiis, Tryon, Am. Journ Conch., iii, 171, jjI. xiii,rig. 16 (1867). 

 Tlidtiinostiis l/flr(fl', Tryox, Am. Jonrn. Couch., iii, 172, pl. xiv (lH(i7). 

 Ihilimtdiiii alti-niatus, W. G. Binney, Terr. Moll., v, 388. 



Texan Sobregion, from Louisiana through Texas into Mexico. It 

 belongs rather to the fauna of Mexico, extending into the Isthmus of 

 Tehuantepec* Found in great numbers upon bushes, the ground be- 

 low them being often covered with dead shells. 



This species is readily distinguished from the allied forms by its 

 greater soli-lity, its highly polished surface, its ^'^- '^^^■ 



more elongated form, its dark-colored aperture, 

 bordered with the white internal margin of the 

 peritreine, and the tooth-like callus upon the 

 upper portion of the columella. It varies con- 

 siderably in form, being sometimes quite slen- 

 der, at others quite globose. In color it shows 

 every variation from uniform brownish to pure 

 wbite. The aperture, however, is always dark, n. aitcmatus. 



and has a white, thickened rim within the peristome. It is most at- 

 tractive when ornamented with alternate white and brown longitudinal 

 blotches. 



There can, I believe, be no doubt that the shell under consideration 

 is what Mr. Say described as aliernahis. His description is given above, 

 and a copy (Fig. 432) of a colored drawing by Mrs. Say, under which 

 is written, in Mr. Say's hand, '■' BuUmns olternatvs, Mexico, Wm. Ma- 

 clure." 



The species was known to Dr. Binney and figured in the Terrestrial 

 Mollusks, but as a variety of B. dealhatus. Plate LI, />, and the upper 

 and lower figures of Plate H, <*, certainly represent the species. The 



* Forbes (Proc. Zool. Soc, 1850,54) mentions a Bidimulus alternaius from Panama. 



