NO. nil. PROCEEDINGS OF THE NATIONAL MUSEUM. 339 



related to H. Johrii, from which they differ by having a more elevated 

 spire and the last whorl eveuly rounded, instead of shouldered and 

 subangular, and the shell is smaller, measuring 10 in major and 14.5 

 in minor diameter, and 9 mm. in height. The number of whorls, the 

 aperture, nucleus, and umbilicus do not differ to any important extent 

 in the two forms. It is i)robable, as originally stated by Newcomb, 

 that his types came from Arizona, since the associated H. magilalcnensis 

 is not known from Lower California, and that, as in so many other cases, 

 the specific form represented by H. lohrii has a large and a small race, 

 fairly constant in their several localities, but connected by occasional 

 intermediate specimens. As the oldest name is that of Kewcomb, this 

 should be kept for the species, while Gabb's name may be preserved 

 for the larger and depressed peninsular race in a subspecific sense. 

 Both are distinguished from H. magdalenensis and its allies by the 

 wider umbilicus and by the wide reflexed lip, the peristome in the last- 

 mentioned group being somewhat expanded and slightly thickened, 

 but not forming a reflected lip, properly speaking. 



EPIPHRAGMOPHORA MAGDALENENSIS, Stearns. 



Helix {Arionta) magdalenensis, Steakxs, Proc. U. S. Nut. Mus., XIII, p. 207, 

 pi. XV, figs. 7, 11, 13 (uot 12), 1890. 



Found by V. Bailey on top of a mountain 1,000 feet above Magda- 

 lena, Sonora, Mexico, among rocks; also by Dr. Fisher and Mr. E. W. 

 IS^elson, in Johnson Canyon, near the Panamint Yalley, California, at 

 an altitude of 0,000 feet; and by Vernon Bailey near Besting Springs, 

 California, among rocks on a dry hill 900 feet above the springs, during 

 the Death Yalley expedition. A form (No. 130003, U.S.jS'.M.) which 

 may be a dwarf of the next species or a variety of the present one was 

 collected on San Jose Mountain, Sonora, Mexico, near the boundary liue, 

 by Dr. Mearns. 



This species as originally described is small and depressed, having 

 when fresh a translucent, polished dark-brown color, with a i^ale chest- 

 nut-brown line above the shoulder. The fact that dwarf specimens 

 occur rather frequently with nearly all the species of this group ren- 

 ders it difticiilt to distinguish the normally small species from the small 

 individuals of similar larger species. All the species being more or les« 

 variable in form and surface texture, the group is one which presents 

 unusual difficulties to the student. 



EPIPHRAGMOPHORA HACHITANA, Dall. 

 (Plate XXXI, figs. 7, 10.) 

 Epij)liragmophora hachitana, Dajll, Proc. U. S. Nat. Mus., XVIII, p. 2, 1895. 



Shell large, depressed, polished, sculptured with irregularly promi- 

 nent incremental lines, but without spiral striation or surfiice granula- 

 tion; with 4^ rounded w^horls; suture distinct; last whorl near the 



