SPIRAXIS. 21 



6. S. SCALARIOPSIS (Morelet). PI. 2, fig. 17. 



Shell imperforate, long-turrite, thin, subdiaphanous, with 

 rather distant acute longitudinal riblets; uniform pale buff- 

 whitish. Spire long, the apex rounded, obtuse ; suture rather 

 deeply impressed. Whorls 9, convex, rather swollen, the em- 

 bryonic first l 1 /^ smooth, the following longitudinally obso- 

 letely multistriate, the rest 'Costulate ; last whorl much shorter 

 than the spire, less remotely ribbed, somewhat tapering at 

 base. Aperture small, angulate-ovate; peristome simple, buff- 

 whitish, the margins separated, columellar margin straight, 

 receding, subreflexed, twisted within above, forming an tangle 

 with the rounded basal margin; outer margin subflexuous, 

 acute. Length 11, diam. 4, aperture 2.25 x 1.5 mm. (C. & F.) 



Guatemala : dense woods of the province Peten, under rotten 

 logs. (A. Morelet). 



Bulimus scalariopsis MOREL., Testacea Novissima ii, p. 11 

 (1851). PPR., Monogr. iii, 393. Spiraxis s., FISCHER & 

 CROSSE, Miss. Scient, Mex., Moll., p. 609, pi. 25, f. 1. -MAR- 

 TENS, Biologia p. 308. 



The ribs are more widely spaced than in other known 

 species. 



7. S. SULCIFERUS (Morel.). Vol. I, p. 51. 



Var. cobaneusis Marts. 



Var. berendti Pfr. Vol. I, p. 51. 



8. S. TENUIS Pfeiffer. PI. 2, fig. 18. 



Shell imperforate, conic-turrite, thin, closely thread-costu- 

 late throughout, pellucid, greenish-hyaline. Spire regularly 

 tapering, the summit rather obtuse. Suture crenulated with 

 very minute folds. Whorls 9, a little convex, the last slightly 

 exceeding one-fourth the total length, rounded at base. Colu- 

 mellar plate slightly twisted, somewhat calloused, resembling 

 an oblique truncation' of the base. Aperture slightly oblique, 

 S'ubrhoinbic-oval ; peristome simple, unexpanded. Length 8, 

 diam. of last whorl 3 mm., aperture 2.25 mm. long. (Pfr.). 



Mexico: Orizaba (Salle). 



