130 BULIMULUS-ORTHOTOMIUM. 



* 



Texas: on the Red River in Cook and Montague Counties (G. H. 

 Ragsdale) ; along the Rio Grande at Comstock (Win. Lloyd) and 

 Langtry (V. Bailey), Val Verde Co; Fort Clark, Kinney Co. 

 (Mearns). 



Bulimulus ragsdalei PILS., Nautilus, iii, p. 122 ; v, p. 37, pi. 2, f. 3 ; 

 Proc. Acad. Nat. Sci. Phila., 1890, pp. 64, 296, pi. 5, f. 3. W. G. 

 BINNEY, Fourth Supplement to Terr. Moll., v, in Bull. Mus. Comp. 

 Zool., xxii, p. 191, pi. 2, f. 9 (not good). Bulimulus dealbatus var. 

 =B. ragsdalei STEARNS, Proc. U. S. Nat. Mus., xiv, 1891, p. 97. 

 Bulimulus dealbatus ragsdalei Pils., DALL, Proc. U. S. Nat. Mus. 

 xix, p. 374. 



Var. MOOREANUS ('W. G. B. ' Pfeiffer). PI. 25, fig. 55; pi. 17, 

 figs. 2, 3, 4, 5. 



Shell umbilicate, ovate-conic; white above, coffee-with-cream 

 colored below the periphery, or with the basal tint absent ; some- 

 times varied with waxen or dark gray streaks, and often showing 

 scattered gray dots which are translucent by transmitted light. Sur- 

 face smooth, under the lens showing more or less strongly developed 

 strim on the spire; apex waxen or dark. Alt. 25, diam. 12 mill., 

 but varying much in proportions. 



Texas, mainly from Fort Worth to DeWitt and Uvalde Counties. 



Bulimus sehiedeanus var. AY. G. BINNEY, Terr. Moll., iv, p. 129, 

 pi. 80, f. 8. Bulimus mooreanus " W. G. Binney " PFR., Monogr., 

 vi, p. 143. Bulimulus sehiedeanus var. mooreanus W. G. B., L. &. 

 F.-W. Sh. N. A., i, p. 205, f. 353-355 ; Terrestr. Moll., v, p. 392, f. 

 277-279 ; Man. Arner. L. Sh., Bull. U. S. Nat. Mus., No. 28, p. 400. f. 

 438-440. 



This is the abundant form throughout central-southern Texas, 

 particularly in the region about San Antonio. It lives in vast 

 numbers in the mesquite chaparral, hibernating in the earth, acti- 

 vating upon the bushes, adhering to the bark. It is smaller, thin- 

 ner and smoother than the typical sehiedeanus, and more northern 

 in distribution. The streaked specimens show all stages between 

 mooreanus and dealbatus, and with a large geographic series it is 

 easy to demonstrate the complete intergradation of the two. 



This is the form commonly known as " sehiedeanus ' among 

 American collectors. 



