6 MOL L USES FROM MEXICAN BO UNDAB Y SUB VET— D ALL. vol. xviii 



rather strong concentric sculpture; cardinal teeth strong-, short, rather 

 ragged; laterals short, club-shaped, heavy, granular, or striated; nacre 

 soft silvery white; shell near the beaks with obscure, narrow plica- 

 tions. Height, 33; length, 55; diameter, 20 mm. 



Localiti/. — Guadelupe Elver, Victoria County, Texas, Hon. J. D. 

 Mitchell; Eio Salado, near New Leon, Mexico. 



This species probably groups with Unio roicellH and scamnatus, 

 though no other members of the group have pustules or plications. 



EPIPHRAGMOPHORA ARNHEIMI, Ball. 



Ariontu vuliforniensis, Lea, var. ramentosa, Gould, small variety, W. G. Binney, 

 Bull. U. S. Nat. Mus., XXVIII, p. 133, fig. 108, 1885. 



This small species has been referred to californiensis as a subvariety, 

 but a series of forty-three very uniform specimens from various locali- 

 ties indicates that it is a distinct species. 



Ty2)e.—:So. 39012, U. S. N. M. ; Nachoguero Yalley, California, Dr. 

 Mearns: San Pablo, Arnheim. 



CERION (MAYNARDIA) PINERIA, nqw species. 



Shell small, whitish, obliquely mottled with pale brownish flammules, 

 sometimes nearly all brownish, with about eight whorls; nucleus smooth, 

 brownish, of a whorl and a half, followed by fine, narroAv, oblique, sub- 

 equal riblets crossing the whorl, with about equal interspaces; apex 

 dome-shaped ; body of the shell subcylindrical, base slightly attenuated, 

 with no umbilicus; aperture rounded, except over the body, with a 

 thick, white, well-reflected lip, parietal and pillar lips each with a low 

 medial tubercle or tooth; length of shell, 14; diameter, G.5 mm. 



This is nearest related to Pupa cyclostoma, Kiister, but is small 

 and easily distinguished by its finer, closer, and more even ribbing. 

 Like all the species of its genus it is variable, and has among others a 

 small variety with very regular ribbing which hardly exceeds 10 mm. 

 in length, and is doubtless the smallest form belonging to the genus 

 which has yet been reported. 



Ty2)e.—l^o. 107329, U. S. N^. M. ; Isle of Pines, Johnson. 



