226 HELIX-LYSINOE. 



neighborhood of Mulege, Lower California. H. carpenteri New- 

 comb, which is a synonym of H. remondi, is credited by the author 

 to " Tulare Valley, " and has been found in other localities in Cal- 

 ifornia. A glance at the map will show how widely separated 

 geographically H. coloradoensis is from its nearest allies, and this 

 discovery of Dr. Merriam's extends the distribution of the west 

 coast type of Helices farther to the eastward than heretofore, and 

 adds an area of great extent to that previously known. (Stearns.*) 

 Figures 7 and 12 of Stearns' plate were transposed. 



H. MAGDALENENSIS Stearns. PI. 56, figs. 4, 5, 6. 



Shell orbicular, much depressed, apex whorls but very slightly 

 elevated, suture well defined. Whorls three and a half to four, 

 flattened above, slightly obtusely angulated on the periphery, and 

 rounded below. Umbilicus open, showing the whorls ; upper line 

 of the mouth more or less slanted downward where it joins the body 

 whorl, varying in this character in different specimens. Aperture 

 broader than high, ovate, somewhat oblique, slightly effuse, and 

 thickened and reflected a little at the edge, more so in the umbilical 

 region, where it partially overhangs the umbilicus. In some exam- 

 ples a thin deposit of callus on the parietal wall suggests a continu- 

 ous peristome. Surface sculptured by the ordinary lines of growth, 

 which vary in prominence in different individuals. Color, dingy 

 whitish, the specimens, nine in number, being dead, with an obscure, 

 narrow, reddish-brown band just above the periphery. (Stearns.) 

 Alt. 6J, greater diam. 13, lesser 10 mill, (largest spec.) 

 Alt. 5J, greater diam. 10j, lesser 9 mill, (smallest adult.) 

 Magdalena, State of Sonora, Mexico, on the line of the Sonora, 

 New Mexico and Arizona Railroad, which terminates on the Gulf 

 of California at Guaymas ; among rocks on the top of a mountain 

 at an elevation of 1,000 feet above the town. 



Helix (Arionta) magdalenensis STEARNS, Proc. U. S. Nat. Mus. 

 xiii, 1890, p. 207, 1. 15, f. 11, 13, 7. 



This species in its principal features, indicates a relationship with 

 its geographical congener, H. rowelli, Newcomb, which has been 

 found in the Salt River Mountains, 7 miles north of Phoenix, Ari- 

 zona (Pilsbry). H. lohri Gabb, which is regarded as a synonym of 

 rowelli, collected by its author on the table-lands of Low 7 er Califor- 

 nia near Mulege, and it has also been credited to Chihuahua, Mex- 

 ico, and farther eastward to " Texas, ' upon what authority I am 



