NO. 2217. THE GENUS EPITONIVM AND ITS ALLIES—DALL. 475 



The next group in order is Asperiscala De Boury, 1909, of which 

 the type is the elegant Scalaria hellastriata of Carpenter, 1864, which 

 has 15-16 varices and clean-cut spiral sculpture. Its ranges from 

 Monterey to San Pedro, California. The only other described 

 species of this group from the coast is E. loweA Dall, 1906, a species 

 with 26 varices from Catalina Island. There are quite a number 

 of hitherto imdifTerentiated forms of this group in the United States 

 National Museum collection, fis foUows: 



EPITONIUM ACAPULCANUM, new species. 



Shell smaU, white, acute, imperforate, \\ath a slender three-whorled 

 smooth nucleus and five subsequent whorls; varices 11, continuous, 

 over the suture up the spire which they nearly encircle; spiral sculp- 

 ture of closely adjacent flattish threads covering the whorl; anterior 

 face of the varices smooth, without any spinosity at the shoulder. 

 Length, 5; diameter, 2.5 mm. U. S. Nat. Mus. Cat. No. 59337. 

 Range, La Paz to Acapulco. 



EPITONIUM COOKEANUM, new species. 



Shell small, pink, solid, acute, imperforate, the nucleus lost, with 

 eight well-rounded subsequent whorls; with 10 rather solid, smooth 

 continuous white varices making less than half a turn round the 

 spire; spiral sculpture of extremely fine imiform threads covering 

 the whorl between the varices; the terminal varix thicker than the 

 others; all the varices broader at the intersection with the sTiture 

 but not spinose. Length, 9.5; diameter, 4 mm. U. S. Nat. Mus. 

 Cat. No. 211019. Range, San Diego to the Gulf of California. 



This is named in honor of Miss J. M. Cooke, of San Diego, a most 

 assiduous collector, to whom, and to the work of her late brother, 

 the Museum is indebted for much interesting material. 



EPITONIUM XANTUSI, new species. 



Shell small, acute, white, thin, with seven well-rounded whorls 

 exclusive of the (lost) nucleus; varices low, thin, sharp, 12 in number, 

 continuous over the spire which they half encircle, but not expanded 

 over the rather deep suture; spiral sculpture of flattish adjacent 

 threads over the whole surface of the whorl between the varices; ter- 

 minal varix hardly thicker, none of them spinose. Length, 5.5; 

 diameter, 3 mm. U. S. Nat. Mus. Cat. No. 4107. Range, Cape 

 San Lucas (Xantus) and La Paz, Lower California. 



EPITONIUM ARNOLDI, new species. 



Shell of moderate size, white, thin, with eight well-rounded whorls 

 exclusive of the Gost) nucleus; varices on the last whorl 13, on the 

 first four whorls they are feeble, on the next two distinct and crowded, 

 on the last two more distantly spaced, low, and cord-Uke; spiral 



