BULIMULUS-ORTHOTOMIUM. 149 



yellowish, more or less regular, sparse streaks; irregularly and 

 coarsely striate ; oblong-ovate. Apex obtuse, generally eroded, 

 closely and most minutely costulate. Whorls 6, convex, regularly 

 increasing, separated by a deep and narrow suture ; the last whorl 

 large, inflated, nearly half the length of the shell, a little ascending 

 in front. Aperture vertical, elongate, the margins subparallel, ex- 

 ternal margin slightly curved, basal arcuate, columellar broadly ex- 

 panded, white, partly covering the umbilicus ; peristome straight, 

 acute, white. 



Alt. 20-22, greatest diam. 10-12 ; aperture with peristome 10 

 mill, long, 7 wide. (Mabille). 



" Sierra de la Victoria" Lower California (Diguet). 



Bulimulus (Thaumastus) Digueti MAB., 1. c., p. 69. 

 B. BELDINGI Cooper. PI. 25, fig. 56. 



Shell deeply rimate, oblong-conic, chestnut-brown with a few in- 

 conspicuous lighter streaks, becoming purplish-black toward the 

 apex, lighter below the sutures ; rather solid. Surface slightly shin- 

 ing, with light wrinkles of growth, no spiral striae. Whorls 6 or 6, 

 the earliest subcarinate above, with deep apical dimple and sculpt- 

 ure of delicate vertical riblets, the others slightly convex. 



Aperture long oval, purplish with the luster of satin within ; per- 

 istome expanded, narrowly reflexed, fleshy-brown ; columella with 

 a faint long fold. 



Alt. 29'5, diam. 13, alt. of aperture 14'5 mill. 



Alt. 32, diam. 14, alt. of aperture 15 mill; 



Mountains of Lower California, near Cape St. Lucas. 



Bulimulus inscendens var. beldingi COOPER, Proc. Cal. Acad. Sci. 

 (2), iii, p. 209, 1892 ; p. 340, pi. 13, f. 5, 1893 ; iv, p. 137, 1894. 

 Bulimulus (Leptobyrsus) inscendens var. beldingi DALL, Proc. U. S. 

 Nat. Mus., xvi, 1893, p. 643. Bulimulus beldingi DALL, Proc. U. 

 S. Nat. Mus., xviii, 1895, p. 5. B. {Orthotomium) beldingi DALL, 

 Proc. U. S. Nat. Mus., xix, p. 357. 



More compact, and stouter than B. inscendens, with the peristome 

 more reflexed ; no spiral striatiou or granulation ; the typical beld- 

 ingi is also smaller. 

 Var. alta Dall. PL 20, fig. 76. 



Whorls rounder, shell shorter, last whorl 25-38, aperture 20-38 

 of the whole length. Whorls 7i; alt. 38, diam. 14 mill.; alt. of 

 aperture 20 mill. 



