66 THE NAUTILUS. 



NEW CUBAN UROCOPTIS OF THE U. CINEEEA GROUP. 



BY DOCTOR CARLOS DE LA TORRE. 



(Concluded from page 58). 

 Urocoptis bacillaris albicostulata n. subsp. Plate vi, fig. 9. 



This species differs from the type and its other varieties in the 

 sculpture of stronger white thread-like riblets. 



Long. 18.2, diam. 2.9, whorls 17. 



Long. 12.9, diam. 2.1, whorls 13. 



Central Cuba: On stones at Cueva Bonita and Rosa Perdida in 

 the northeastern limit of the Santa Clara Province. 



Urocoptis bacillaris sordidula n. subsp. Plate vi, fig. 11. 



This is the smallest of the bacillaris race. It is slenderly fusi- 

 form and truncate above, corneous and whitish streaked but the sur- 

 face is lusterless; sculptured with less oblique and sinuous thread- 

 like riblets separated by less wide intervals. Whorls 10-41 a little 

 convex, the last free in a shorter neck, with the aperture more ob- 

 lique. Axis twisted and encircled by an inconspicuous spiral thread, 

 minutely spinose above. 



Long. 12, diam. 2.1, ap. diam. 2 mm., whorls 12. 



Central Cuba : On stones along the road east of El Bano de 

 Mayajigua in the Province of Santa Clara. 



This may be regarded as a degenerate form of U. bacillaris living 

 in the plain near the foot of the mountains where the typical form 

 lives. 



U. (Gongylostoma) stricta n. sp. Plate vi, figs. 16, 17. 



Differs from U. bacillaris in its more slender shell which in this 

 species is not swollen and is almost cylindric in the middle third ; 

 also differs by the sinuous, well-raised riblets, more regularly wide- 

 spaced throughout which are somewhat tubercular at their upper 

 ends. Whorls slightly convex. Axis encircled by a thread-like 

 spinose lamella which in some of the whorls has an indistinct spiral 

 cord above it. 



Long. 19, diam. 2.2, ap. diag. 2, whorls 



Long. 13.7, diag. 2, whorls 12. 



