NO. nil. PROCEEDINGS OF THE NATIONAL MUSEUM. 359 



2 wlioils, and about 2;^ rapidly enlarging later whorls. The sutnre is 

 distinct, but not deep, the shell, when adult, is i)robably about the 

 shape of sujfiatus, but thinner; the umbilicus is deep, but very small, 

 and almost hidden by the reflection of the pillar lip; the base Is 

 rounded; the surface marked by inconspicuous incremental lines and 

 by spiral, microscopic but sharp, distant, slightly elevated lines, be- 

 tween which are still finer spiral striations. The general surface is 

 not polished, even when perfectly fresh, but the wear on the fine ele- 

 vated lines seems to polish them, so that under a strong triplet they 

 shine against the duller background of the rest of the surface. This 

 sculpture is very characteristic and quite unlike that of any other 

 Lower CaUforiiian species. The shell above described measures 11.5 

 mm. high, of which the last whorl stands for 10 mm. and 9.5 mm. in 

 diameter. It w^as collected by Eisen in the Sierra San Lazaro, near 

 Cape St. Lucas, in September, 1891. 



BULIMULUS (ORTHOTOMIUM) LEVIS, Dall. 



Bulimulns xantusi Tar. leris, Dall, Proc, U. S. Nat. Mus., XVI, p. 641, 1893. — 



Cooper, Proc. Cal. Acad. Sci., 2 ser., IV, p. 139, pi. v, Hg. 14, 1894. 

 Biilimulus levis, Dall, Proc. U. S. Nat. Mus., XVIII, p. 5, 1895. 



Several fresii specimens obtained by Dr. Eisen on his last trip show 

 that this species is covered with a smooth, polished, greenish-yellow 

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

 B. XKntiisi, and it is absolutely without granulation. There is no 

 doubt but that this is a distinct species, which can retain the varietal 

 name in a specific sense. Decorticated specimens may have been dis- 

 tributed under the name of xantitsi, by collectors, but the original 

 figured type of Mr. W. G. Biuney must be taken as the standard for 

 that species. With it the B. gabbii of Crosse and Fischer is identical, 

 and must fall into synonymy. 



BULIMULUS (ORTHOTOMIUM) PILULA, W. G. Binney. 



This species does not appear among the shells forwarded for exam- 

 ination by Dr. Cooper. Of those sent under this name the majority 

 were small or immature specimens of B. sufflatus, Gould, and its 

 variety, chinchensis, Cooper. 



Section PlICOLUMNA, Cooper. 



Plicohtmna, Cooper, Proc. Cal. Acad. Sci., 2 ser., V, p. 164, June, 1895. 

 Fseudorhodea, Dall,' Nautilus, IX, p. 51, Sept., 1895; Proc. U. S. Nat. Mas., 

 XVIII, p. 5, 1895. 



Shell resembling that of RJiodea, Adams, but without a keel on the 

 ui)per side of the suture in the later whorls, without a channel behind 



'The duplicatiou of names is the result of my absence in Alaska at the time of 

 the printing of both Dr. Cooper's paper and my own, which, as manuscript, was the 

 earlier of the two. 



