BULIMULUS-ORTHOTOMIUM. 131 



Var. SCHIEDEANUS (Pfeiffer). PL 17, figs. 6 to 15. 



Ovate-conic, often with the spire rather attenuated above, solid 

 and strong, calcareous, white, rarely with ochreous streaks ; roughly, 

 irregularly striate, not much shining; spire as long as the aperture. 

 Aperture varying from white to ochrey inside ; peristome without 

 an internal callous rim. 



Alt. 31, diarn. 17, alt. aperture 17 mill. (Pfr. type). 



Alt. 34, diam. 18, alt. aperture 15? mill. (Coahuila). 



Alt. 30, diam. 15, aperture 14 mill, (western Texas). 



Mexico (Dr. Schiede, original locality); Tehuacan, State of Pue- 

 blo, (F. C. Baker, Uhde and others) ; Laguna de Chapala, Jalisco 

 (Deppe) ; Villa Lerdo, Durango (Hoge), States of Tamaulipas 

 (Binney) and Coahuila (W. H. Dougherty), western Texas along 

 the Rio Grande (H. C. Wood). 



Bulimus schiedeanus PFR., Symb. Hist. Hel., i, p. 43 (1841) ; in 

 Philippics Abbild. Neuer Conch., i, p. 56, Bulimus, pi. 1, f. 12 ; Mon- 

 ogr. Hel. Viv., ii, p. 187 ; in Martini & Chemnitz, Syst. Conch. Cab. 

 ed. 2, Bulimus, p. 160, pi. 46, f. 3, 4. REEVE, Conch. Icon, v, Bul- 

 imus, pi. 54, f. 361. BINNEY, Terr, air-breath. Moll, of N. Am., iv, 

 p. 129, pi. 80, f. 8 (var.), 15. Bulimus (Mesembrinus') schiedeanus 

 ALBERS, Die Hel., ed. 1, p. 157. PFR. in Malak. Bliitt., ii, p. 158 

 (1855). Orthalicus (Mesembrinus) schiedeanus H. & A. ADAMS, 

 Gen. Rec. Moll., ii, p. 157. Bulimulus ( Thaumastus) schiedeanus 

 v. MART, in Albers Die Hel. ed. 2, p. 215. FISCH. & CROSSE, 

 Miss. Scient. Mex., Mollusca, i, p. 563, pi. 24, f. 2. Bulimulus 

 (Scutalus) schiedeanus v. MART, in Malak. Blatt., xii, p. 30 (1865). 

 Thaumastus schiedeanus TRYON, Am. Journ. Conch., iii, p. 172, 

 pi. 10 (14), f. 1, 4 (1868). Bulimulus schiedeanus BINNEY & BLAND, 

 Land and Fresh-water Shells of N. Am., i, p. 204, f. 352 ; BINNEY, 

 Terr, airbreath. Moll, of N. Am., V, (Bull. Mus. Com p. Zool., iv, p. 

 391), f. 276 (1878) ; Bull. Mus. Comp. Zool., v, p. 338, pi. 1, f. E 

 (1879); Manual of Am. Land Shells, p. 399, fig. 437. STREBEL, 

 Beitr. Mex. Land-und Siissw. Conch., iv, pi. 6, f. 19 ; v, p. 57, pi. 11, 

 f. 16, 17. VON MARTENS, Biol. Centr. Amer., Moll., p. 239, pi. 15, 

 f. 12-23. Bulimus niveus HEGEWISCH, in litt. Bulimus candidis- 

 simus NYST, in litt. ? Bulimus xanthostomus WIEGM. in Berlin 

 Museum. 



The typical schiedeanus ranges over the greater part of central, 

 north-central and northeastern Mexico, and in the region immediately 



