8 PSEUDOSUBULINA. 



regularly tapering to the obtuse summit, thin, whitish-cor- 

 neous. 'Sculptured with 'dose, delicate, vertical, thread-like 

 riblets scarcely half as wide as the intervals. Whorls 12, 

 convex, the first smooth, sepa/rated by deep sutures. Aper- 

 ture small, ovate, the lip thin and simple ; columella thin, con- 

 cave, passing without notch into the basal margin, though a 

 very indistinct angle is traceable at the base of the columella, 

 in an oblique view. Length 10, diam. 2, length of aperture 

 2 mm. 



N.-E. Mexico: Diente, near Monterey, State of Nuevo 

 Leon. (S. N. Rhoads). 



Spimxis ( f) lorealis PILS., Proc. A. N. S. Phila, 1903, p. 

 775, pi. 50, f. 6, 6a. 



This species agrees fairly well with the description of S. 

 acus Shuttl., from Cordova, V. C., except in the smaller size. 

 The typical form of that species has not been figured. In 

 sculpture S. ~borealis is not unlike S. intermedius Strebel, but 

 that species is less slender and has a sinuous, not simply con- 

 cave, columella. The generic position is uncertain, but I am 

 now disposed to think it a Pseudosubulina. 



14. P. EISENIANA (Cooper). PI. 6, fig. 32. 



" Shell sinistral, with a thin brownish epidermis, first two 

 nuclear whorls white, smooth, turbinate, third narrower, and 

 with the rest covered with numerous vertical riblets, increas- 

 ing to about 50 on body-whorl, where they curve round the 

 base and end at the edge of lip. Whorls 17 to 19 regularly 

 and slowly enlarging from the 3d to the body-whorl, which is 

 contracted about one-third, flattened, sutures moderately im- 

 pressed, truncating the riblets. Penultimate whorl swollen, 

 largest, narrowing towards mouth, which is ovate, acute at 

 junction of lips, of which the outer crosses the inner, ending 

 at the sutuse (suture). Length about 0.55 inch, breadth 

 0.08; mouth 0.08 long, 0.09 wide. Shell transparent." 

 (Cooper). 



Lower California (Dr. G. Eisen). 



Melaniella (?) eiseniana COOPER, Proc. Cal. Acad. Sci. 2d 

 Ser., iii, p. 339, pi. 13, f. 3 (May 5, 1893) ; iv, p. 141, pi. 6, 



