BULIMULUS-ORTHOTOMIUM. 145 



Lower Calif ornia, mostly in the mountainous region; Sierra La- 

 guna, 2000-3500 ft. alt. (Eisen and others) ; El Taste Mts., down to 

 1000ft. alt. (Eisen) ; Ranclio de San Bartoto (Diguet). 



Bullmus proteus W. G. BINNEY, Proc. Acad. Nat. Sci. Phila., 

 1861, p. 331. Bulimulus (Scutalus) proteus BINN. & BLD., Land 

 and Freshwater Sh. N. A., i, p. 207, f. 358. COOPER, Proc. Cal. 

 Acad. Sci. (2) iii, pp. 211, 208 ; Zoe, iii, p. 15. Bulimulus (Scuta- 

 lus^) montezuma DALL, Nautilus, vii, p. 27 ; Proc. U. S. Nat. Mus. 

 xvi, 1893, p. 640, pi. 82, f. 1. COOPER, Proc. Acad. (2), iv, p. 136, 

 pi. 6, f. 26. MABILLE, Bull. Soc. Philomath, de Paris, (8), vii, p. 68 

 (1895). 



" As Dr. Cooper observed, this species is not as " Protean " as some 

 others. It exhibits no such variations in form or color as B. proteus ; 

 the latter assumes almost every mutation of form, but taken on the 

 average is less acute and has the last whorl less patulously drawn 

 out, axially, than the B. montezuma. The color of B. proteus is 

 variably distributed, but tends in the most strongly colored exam- 

 ples to be laid on in 4-6 broad, spiral bands of brown, with indis- 

 tinct boundaries, separated by paler zones. In B. montezuma the 

 color is seldom present, but, when it is, it is laid on in narrow, 

 obscure zones, parallel with the incremental lines and never spirally 

 disposed. The granulation in the Californian shell is less coarse 

 and intense than in the Peruvian species when most developed, and 

 the umbilicus averages much smaller in the former. All these char- 

 acters are of degree rather than kind, but two features may be men- 

 tioned which appear constant and specific. In the Mexican shell 

 the angle which the outer lip makes with the body whorl, or axial 

 perpendicular, at its junction is invariably more acute than in B. 

 proteus, which latter has the lip bent suddenly down at this point. 

 Secondly, the larval shell or nucleus of B. proteus is beautifully 

 shagreened with minute punctations or short, almost vermicular, 

 indentations, visible plainly under a glass, and only absent when 

 worn off by abrasion. Tracesof this sculpture may always be found. 

 In B. montezuma the nucleus is delicately ribbed in harmony with 

 the incremental lines, and does not show the peculiar shagreening 

 alluded to, a character which alone is sufficient to establish its dis- 

 tinctness." (Dall). 



B. BAILEYI Dall. PI. 19, figs. 65, 66, 67. 



Shell when perfectly fresh with a delicate brownish epidermis, 

 which is usually lost, beneath which the shell is brownish flesh color 

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