132 BULIMULUS-ORTHOTOMIUM. 



north of the Rio Grande. It is abundant as far south as the State 

 of Pueblo, where it was collected by the Mexican expedition from 

 the Academy of Natural Sciences and by Uhde and Ho'ge. 



Typical schiedeanus does not occur in central southern Texas, 

 being replaced there by mooreanus, a more glossy, generally thinner 

 shell, smoother below and with regular striation on the spire. 



A form of schiedeanus from along the Rio Grande below El Paso 

 has oblique ochre-red stripes on the body-whorl (fig. 6). The spire 

 is slender above, as in the large, pure white specimens from the 

 State of Coahuila (figs. 14, 15). Figs. 7-13 represent Mexican 

 specimens. 



Var. PATRIARCHA (W. G. Binney). PI. 17, fig. 16. 



On the average larger than schiedeanus, with shorter, acuminate 

 spire and more globose body-whorl. Solid and roughened, white ; 

 aperture ochre colored inside. Alt. 35, diam. 19, length of aperture 

 19 mill. 



Northeastern Mexico at Buena Vista, State of Nuevo Leon (Ber- 

 landiere) ; Also in Texas (W. G. Binuey). 



Bulimus patriarcha BINNEY, Proc. Acad. Phil., 1858, p. 116; 

 Terr, air-breath. Moll, of N. Am., iv, p. 130, pi. 80, f. 13. PFR., 

 Monogr. Hel. Viv., vi, p. 143. Thaumastus patriarcha TRYON, Am. 

 Journ. Conch., iii, p. 171, pi. 9 (13), f. 15. Bulimulus patriarcha 

 BINNEY and BLAND, Land and Fresh-water Shells of N. Am., i, p. 

 200, f. 346; BINNEY, Terr, air-breath. Moll, of N. Am., v, p. 388, 

 f. 270 ; Manual of Am. Land Shells, p. 396, f. 4^1. Bulimulus 

 (Thaumastus) patriarcha FISCH. & CROSSE, Miss. Scient. Mex., Mol- 

 lusca, i, p. 564. Bulimulus schiedeanus var. patriarcha MARTENS, 

 Biol. Amer. Centr., Moll, p. 242. 



This form seems quite distinct when compared with the so-called 

 B. schiedeanus (==mooreanus) of central Texas, but its differences 

 from the true schiedeanus of Mexico are only slight. Von Martens,, 

 with his usual excellent judgment, unites them. 



B. ALTERNATUS (Say). PI. 25, figs. 50-53 ; pi. 17, figs. 17, 18, 20, 

 12, 22-26. 



Shell ovate oblong, umbilicate, solid and strong, nearly smooth ; 

 the whorls of the spire not regularly striated. White, varying to 

 blue or pink tinted, or suffused with coffee-brown, and usually with 

 scattered gray dots, or alternately white and gray or brown striped. 

 Aperture oblong, very dark chestnut within, or sometimes ochrace- 



