1903.] NATURAL SCIENCES OF PHILADELPHIA. 775 



by Mr. Rhoads contained several other species of Pseudosubulina not 

 yet identified. 



STENOGYRID^. 

 Opeas octonoides (C B. Ad.) 



Antigua, V. C. 

 Opeas micra (Orb.)- 

 Antigua, V. C. 

 Opeas rhoadsae Pils. PI. L, fig. 4. 



Proc. Acad. Nat. Sci. Phila., 1S99, p. 399. 

 Diente, near Monterey, Nuevo Leon. Types No. 77,103, A. N. S. P. 

 The specimen figured measures 3.1 x .7 mm. 



Opeas odiosum Pils. PL L, fig. 3. 



Proc. Acad. Nat. Sci. Phila., 1S99, p. 399. 

 Patzcuaro, Michoacan. Types No. 77,100, A. N. S. P. 



Opeas patzcuarense Pils. PI. L, fig. 5. 



Patzcuaro, Michoacan. Types No. 77,151, A. N. S. P. 



Tlie specimen figured measures length 3.35, diam. .9 mm. 



^Ir. Rhoads also collected about a dozen species of minute Steno- 

 gyroid snails not yet identified, several of them found in some abund- 

 ance. 



Spiraxis uruapamensis Pils. PI. L, fig. 9 and the fig. between 9 and 10. 

 Proc. Acad. Nat. Sci. Phila., 1899, p. 398. 

 Uruapam, Michoacan. Types No. 77,160, A. N. S. P. 



Spiraxis (?) borealis n. sp. PI. L, figs. 6, 6a. 



Shell wholly imperforate, very slender and long, regularly tapering 

 to the obtuse summit, thin, whitish-corneous. Sculptured with close 

 vertical thread-like riblets about half as wide as the intervals, or a 

 little more crowded. Whorls 12, convex, separated by deep sutui'es. 

 Aperture small, ovate, the lip thin and simple; columella thin, concave, 

 passing without angle or notch into the basal margin. Length 10, 

 diam. 2, length of aperture 2 mm. 



Diente, near Monterey, State of Nuevo Leon. Types No. 77,166, 

 A. N. S. P. 



This species agrees fairly well with the description of S. acus Shuttl., 

 from Cordova, V. C, except in the smaller size. That species has not 

 been figured. In sculpture S. borealis is not unlike S. intermedins 

 Strebel. The generic position is uncei'tain. Six specimens taken. 

 Leptinaria mexicana (Pfr.). 



Texolo, V. C. 



