BULIMULUS-ORTHOTOMIUM. 141 



Lower California : Ranclw Lagunas, Ptmta Arena, near sea level 

 (Bryant) ; Sierra Laguna, near La Chuperosa, alt. 2000 ft. (Eisen). 



Bulimulm xantusi var. levis DALL, Proc. U. S. Nat. Mus., xvi, 



1893, p. 642. COOPER, Proc. Cal. Acad. (2) iv, p. 139, pi. 5, f. 14. 



-Bulimulus levis DALL, Proc. U. S. Nat Mus., xviii, 1895, p. 5 ; 



xix, p. 359. Bulimulus xantusi COOP., Proc. Cal. Acad. (2), iii, p. 



213. 



This species is covered with a smooth, polished, greenish-yellow 

 epidermis, with vertical darker streaks, instead of dark brown as in 

 B. xantusi, and it is absolutely without granulation." (Dall). 



Group of B. montezuma. 

 B. EXCELSUS (Gould). PI. 20, figs. 69, 70, 71. 



Shell large, oblong-conic, imperforate but with a conspicuous and 

 deep reversed -sigmoid rimation ; fleshy-brown with oblique pale 

 streaks and whitish below the suture; the lusterless surface rather 

 finely obliquely striated, striae more or less distinctly cut into oblong 

 granules. Spire long conic, the apex obtuse. Whorls 6i to 7, the 

 tip of the first turned in, with a terminal deep comma-shaped dimple, 

 2| nepionic whorls regularly rather delicately costulate; following 

 whorls but weakly convex, the last straight or a trifle ascending in 

 front, oblong. 



Aperture about half the total length, ovate ; peristome broadly 

 expanded, flaring, somewhat reflexed below ; columella dilated, with 

 a rather conspicuous wide fold above (fig. 70). 



Alt. 44, diam. 19 mill. (Gould's type). 



Alt. 55, diam. 28, alt. of aperture 30 mill. (Sinaloa). 



Alt. 55, diam. 27? alt. of aperture 28 mill. (Sinaloa). 



La Paz, Lower California (Xantus, Belding, Fisher) ; Sinaloa 

 State of Sinaloa (W. M. Gabb). 



Bulimus exeelsus GOULD, Journ. Bost. Soc. N. H., vi, 1853, p. 376, 

 pi. 14, f. 3 ; Otia Conch., p. 184. W. G. BINNEY, Terrestr. Moll., 

 iv, p. 24, pi. 79, f. 12. PFEIFFER, Monogr. Hel. Viv., iv, p. 384.- 

 Thawnastus exeelsus TRYON, Amer. Journ. Conch., iii, p. 171, pi. 13, 

 f. 10. Bulimulus (Mesembrinus) exeelsus BINNEY & BLAND, Land 

 and Freshwater Sh. N. A., i, p. 196, f. 342. COOPER, Proc. Cal. 

 Acad. Sci., (2), iii, pp. 101, 209. Bulimulus (Scutalus) exeelsus 

 CROSSE & FISCHER, Moll. Mex., i, p. 514. Bulimulus (Leptobyrsus) 

 exeelsus DALL, Proc. U. S. Nat. Mus., xvi, 1893, p. 643, pi. 72, f. 7. 

 Bulimus elatus GLD., op. cit., p. 408, in expl. of plate. 



