PSEUDOSUBULINA. 5 



base slightly truncate. Length 18, diam. 5, aperture 4.5 x 2.5 

 mm. Last whorl seen from the dorsal side, one-third of the 

 whole length. (Marts.). 



Southwestern Mexico: Omilteme, State of Guerrero, 8000 

 ft. elevation (H. H. Smith). 



P. robusta MARTS., Biologia p. 304, pi. 17, f. 19. (April, 

 1898). 



8. P. FORTIS Martens. PI. 5, fig. 19. 



Shell imperforate, cylindric-turrite, distinctly costulate, the 

 riblets rather wide, about equal to the interstices ; rather solid, 

 pale grayish-yellow. Whorls 9 to 9%, a little convex, suture 

 deep, crenulate ; the last whorl slowly narrowing below, the 

 base rather smooth. Aperture narrowly oblong, the outer 

 margin slightly arcuate, basal rather short, columellar mar- 

 gin subvertical, thick, oblique and slightly truncate. Length 

 13-14, diam. 4, aperture 4x2.25 mm. (Marts.) 



W. Guatemala : El Repose, 800 ft., Las Mercedes, 3000 ft., 

 and Zapote (Champion) ; Miramar near San Francisco and 

 Retalhulen (Stoll). 



P. fontis MARTS. Biologia p. 304, pi. 17, f. 17. (April, 1898). 



"Last whorl, seen from the dorsal side, one-third the total 

 length. The deep sutures are often filled with dirt, and thus 

 appear dark brown." 



9. P. MITESCENS Martens. PI. 5, fig. 10. 



Shell imperforate, subulate-turrite, costulate-striate, the rib- 

 lets rather flattened, wider than their interstices, obsolescent 

 below in the antepenult, penult and last whorls; diaphanous, 

 yellow, glossy. Whorls 10, the first small, subglobose, the 

 second much larger, those following rather flat, suture nar- 

 rowly impressed, crenulate, brownish; antepenult and penult 

 whorls sparsely marked with spiral linear impressions; last 

 whorl smooth at the base, rapidly narrowing. Aperture nar- 

 rowly oblong, the outer margin slightly arcuate, basal rather 

 short, columellar margin sub vertical, thick, obliquely and 

 slightly truncate. Length 16, diam. 4, aperture 4 x 2.33 mm. 

 (Marts.) 



