150 BULIMULUS-ORTHOTOMIUM. 



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

 Nat. Mus., xvi, 1893, p. 643. COOPER, Proc. Cal. Acad. (2), iv, 

 pp. 137, 143, pi. 5, f. 7. Bulimulus (Orthotomium) beldingi var. 

 alta DALL, Proc. U. S. N. Mus., xix, p. 357. 



Var. monticola Ball. PI. 20, fig. 75. 



More slender, smooth, compact, last whorl 23-40, aperture 17-40 

 of the whole length. Recalls B. bryanti but has not the divergent 

 last whorl nor the laminiferous pillar. Whorls 7, alt. 40, diam. 14 

 mill. ; alt. of aperture 17 mill. 



B. inscendens v. monticola DALL, op. cit. B. beldingi v. monticola 

 DALL, op. cit. B. inscendens bryanti COOPER, Proc. Cal. Acad. Sci. 

 iv, pp. 137, 143, pi. 5, f. 8. 



B. CACOTYCUS J. Mabille. 



Shell covered ri mate-perforate, lengthened, somewhat thick, sub- 

 opaque, shining ; rubescent, marked with opaque white streaks ; 

 striated and cancellated with fine decurrent lines. Spire high conic, 

 apex obtuse, striated. Whorls 7, convex-flattened, rapidly increas- 

 ing, separated by a laciniate, impressed suture, margined by a white 

 thread ; last whorl large, subcylindric elongate, a little compressed 

 on the left side, slightly descending in front. Aperture long-ovate, 

 acute above, vertical ; peristome patulous, a little thickened, the mar- 

 gins joined by a very thin, shining, concolored callus; columellar 

 margin white, broadly dilated, covering the rimation, joining the 

 long arc of the outer lip in an obtuse wide angle. Columella 

 twisted, arcuate at base, impressed in the middle. Alt. 58-60, 

 greatest diam. 23 mill. ; aperture with peristome, 33 mill, long, 20 

 wide. (Mabille*). 



Sierras of the south of the Peninsula (Diguet). 



Bulimulus (Scutalus) cacotycus MAB., 1. c., p. 69. 

 B. INSCENDENS (W. G. Binuey). PI. 20, figs. 72, 73, 74. 



Shell thin, deeply rimate, lengthened-oblong ; chestnut brown, not 

 shining. Surface granular, with growth-wrinkles and (typically) 

 fine incised spiral striae, but the latter sometimes wanting or weak. 

 Whorls 7, the apex obtuse, nepionic whorl costulate, subcarinate 

 above with deep apical dimple, the following whorls but slightly 

 convex, last whorl long. 



Aperture less than half the shell's length, ovate; peristome some- 

 what expanded outwardly and below, dilated at the columellar mar- 



