SPIKAXIS. 23 



eostae are much more numerous and more feeble. As I have 

 seen only one specimen, and the number of the whorls is 

 rather few for this genus, it may perhaps be not full-grown, 

 but I know no other species to which it could be referred." 



(v. Mts.) 



11. S. ACUS Shuttleworth. Vol. I, p. 52. 



12. S. MIRADORENSIS Strebel. PI. 20, fig. 4. 



The single example possessed by Strebel is stated to differ 

 from 8. bcrendti in the following respects: It is much 

 smaller; the shape is more slender, more regularly and slowly 

 tapering upwards, the whorls more obliquely coiled, and 

 somewhat terrace-like at the suture, the last somewhat flat- 

 tened laterally. The strong ribs, which project over the 

 suture, stand comparatively farther apart, about 22 on the 

 penult whorl. The columella is strongly twisted, and stout, 

 as in berendti and sulciferus. In color and size it resembles 

 similaris, but differs by its step-like, more convex whorls, 

 more widely spaced ribs, and the stouter, more spiral colu- 

 mella ; yet it may only be a local form of similaris. 



Another form has much more delicate closer ribs, and a 

 weaker, less sinuous columella, approaching similaris, but it 

 is more slender than that, with more separated, more regular 

 ribs. Length 5.2 x 1.3 mm., -with 8 whorls. 



Mexico: Mirador, State of Vera Cruz. 



Volutaxis miradorensis STREBEL Beitrag, v, p. 122, pi. 17, 

 f. 23, 35 (1882). Spiraxis m., MARTENS, Biologia, p. 309, 

 not p. 639. 



13. S. TENUECOSTATUS Strebel. Vol. I, p. 51. 



14. S. SIMILARIS Strebel. Vol. I, p. 51. 



15. S. CONFERTECOSTATUS Strebel. Vol. I, p. 51. 



16. S. INTERMEDIUS Strebel. Vol. I, p. 51. 



17. S. CONPERTESTRIATUS Strebel. Vol. I, p. 52. 



