SPIRAXIS. 27 



Very small, cylindric and obtuse, with somewhat the ap- 

 pearance of S. linearis, from which it differs in sculpture. 



24. S. LINEARIS Pfr. Vol. I, p. 52. 



25. S. BLANDI 'Cross'e & Fischer. Vol. I, p. 52. 



26. S. RHABDUS Pilsbry, n. sp. PI. 6, figs. 25, 26. 



Shell imperforate, very slenderly turrite, thin, whitish 

 corneous, somewhat translucent. Sculpture of even, vertical, 

 rounded riblets as wide as their intervals; the embryonic 

 whorls and the base are smooth. Spire slowly tapering to 

 an obtuse summit. Whorl 10, moderately convex, separated 

 by deeply cut narrow sutures. Aperture small, ovate; colu- 

 melLa nearly straight, a trifle concave, not spirally twisted. 

 Length 6, ddam. 1.3, length of aperture 1 mm. 



Mexico: Texolo, State of Vera Cruz (Rhoads). 



Chiefly notable for its very slender figure and the straight, 

 not sinuous 'Columella. The sculpture is decidedly coarser 

 than in S. delicatus. An example of S. rhabdus 4 mm. long 

 has S 1 /^ whorls, a more regularly tapering spire than S. 

 delicatus, and the base of the last whorl is entirely smooth. 



27. S. STREBELI Pilsbry, n. sp. PI. 6, figs. 27, 28. 



Shell imperforate, turrite, thin, whitish corneous and some- 

 what translucent. Sculpture of fine, even, subvertical rib- 

 sitrise, as 1 wide as their intervals, the first 1% whorls smooth. 

 Spire regularly tapering to the obtuse summit. Whorls l l /2, 

 very convex, parted by deep sutures. Aperture subvertical, 

 the outer lip thin, slightly arched forward. Columella sub- 

 vertical in front view, but very weakly spiral as seen ob- 

 liquely in the aperture. Length 4.5, diam. 1.5, length of 

 aperture 1.25 mm. 



Mexico: Texolo, State of Vera Cruz (S. N. Rhoads). 



While closely related to S. delicatus, this species is much 

 more robust. 'Some dead specimens before me are larger 

 than the type, 5.5 mm. long, with 8 whorls. 



28. S. DELICATUS Pilsbry, n. sp. PL 6, fig. 23. 



Shell imperforate, very slender, turrite, thin and some- 



