28 SPIEAXIS. 



what transparent, whitish corneous. Sculpture of fine, even, 

 subvertacal rib-striae, as wide as the intervals, the striae be- 

 coming wider on the last whorl ; the first l 1 /^ whorls smooth. 

 Spire s'traightly tapering, the summit obtuse. Whorls 8, 

 very convex, separated by deep sutures. Aperture small, 

 ovate, sub vertical ; outer lip simple. Columella nearly verti- 

 cal in front view, but weakly spiral as viewed obliquely in 

 the aperture. Length 4, ddam. 1.1, length of aperture 1 mm. 

 Mexico: Uruapam, State of Michoacan, type loc. ; Texolo, 

 Vera Cruz. (S. N. Rhoads). 



29. S. CACAHUAMILPENSIS Herrera. PI. 2, figs. 24, 25. 



Undescribed, and known from the figures only. These 

 have not much the appearance of Spiraxis, yet no doubt be- 

 long to a species distinct from any described. 



Mexico: Cavern of Cacahuamilpa, State of Guererro. 



Spiraxis c., HERRERA, Memorias y Revista de la Sociedad 

 Cientifica "Antonio Alzate," v, 1891, p. 219, pi. 2, f. 4, 5. 



30. S. MELANIELLOIDES ' Gundl. ' Pfr. PI. 6, figs. 29, 30, 31. 



Shell imperforate, subulate, rather thin, closely subarcu- 

 ately striate, pellucid, waxy. Spire slender, Ithe apex rather 

 acute. Whorls 8, a little convex, the last not one-fourth 

 the total length, somewhat flattened laterally, very obso- 

 letely angular at the base. Columella somewhat thickened, 

 twisted, not truncate. Aperture subvertical, truncate-auri- 

 form; peristome simple, thin, the right margin somewhat 

 arched forward. Length 6.5, diam. 1.66, aperture scarcely 

 1.5 mm. long. (Pfr.). 



Cuba: Brazo del Cauto, near Santiago; found on rotten 

 logs in woods, after rain. (Gundlach). 



Spiraxis melanielloides Gundlach, Pfr., Malak. Bl. v, p. 

 184 (1858) ; Monographia vi, p. 192. Sp. melaniellodes 

 Gundl., ARANGO, Fauna Malac. Cubana, p. 93. Volutaxis 

 melanielloides Gundl., STREBEL, Beitrag Mex. Conch, v, p. 

 125. TRYON, Manual i, p. 52. 



Two and a half apical whorls are smooth, and the summit 

 is less depressed than in the Mexican Volutaxes, the first 



