NO. nil. PROCEEDINGS OF TRE NATIONAL MUSEUM. 337 



Genus EPIPHRAGMOPHORA/ Doring. 



EPIPHRAGMOPHORA ARIZONENSIS, Dall. 



(Plate XXXI, figs. 11, 12.) 



Epiphragmopliora arizonensis, Dall, Proc. U. S. Nat. Mus., XVIII, p. 1 1895. 



Shell small for the genus, moderately elevated, light colored, with a 

 narrow brown band just above the periphery, mostly concealed by the 

 suture, but on the outer side visible within the aperture; whorls 4i, of 

 which 1^ are nepionic and punctate, the remainder with rather well- 

 marked incremental lines and microscopic vermicular markings, of 

 which the longer axes are subparallel to the lines of growth ; suture 

 distinct; whorls full and rounded, but with the periphery slightly above 

 the middle; the last whorl descending a little, near the aperture; base 

 rounded; umbilicus narrow but deep; aperture expanded, the pillar 

 lip reflected, but the outer lip not so; body with a slight wash of callus 

 between the lips; height of shell 11, major diameter 17, minor diameter 

 13.5 mm. 



A single specimen from the banks of the Santa (Jruz Eiver, Tucson, 

 Arizona, Dr. Mearns (Xo. 130002, U.S.^.M.). 



The type specimen is somewhat bleached, but otherwise in good con- 

 dition, and is almost the smallest of the group with which it is associated 

 and of which E. trasJcii, Newcomb, is an exemplar. It agrees with 

 none of the species in detail, in general resembling most some small 

 shells which in the IsTational Museum are labelled as a dwarf race of 

 JE. traskii. Arionta var. indioemiSj Yates, is very similar, but larger, 

 with a more oval aperture and wider umbilicus, and the brown line is 

 not covered by the suture. The species of this group are greatly in 

 need of careful revision. Among those belonging to the peninsular or 

 Sonoran faunre several species have been confused or contested. Thus 

 E. carpenteri., Newcomb, a depressed spirally striated shell has been 

 generally united in synonymy with Leptarionta remoiidi, Tryon. The 

 latter was described from specimens obtained by M. Eemond at Mazat- 

 lan, but which i^robably came from the peninsula of Lower California 

 across the Gulf of California from Mazatlan. At least the Mexican 

 habitat has not been confirmed by subsequent collectors. Gabb obtained 

 it in the mountains of the peninsula near Trinidad and Muleje. One 

 of Mr. Tryon's types is now before me agreeing perfectly with his 

 description and showing the microscopic pustules which in perfect 

 specimens probably support hairs. It has no spiral stria?, and is a 

 smaller and more elevated shell than E. earpenteri. It has been renamed 

 L. verrillii by Ancey," probably because he had received specimens of 

 E. carpenteri under the erroneous nan^e of remondi. Since Polygyra 



1 Arionta of American authors, not of Leach. 

 2 Conch. Exchange, II, p. 63, Nov., 1887. 

 Proc. N. M. vol. xix 22 



