UROCOPTIS, S. G. GONGYLOSTOMA. 201 



). U. DAUTZENBERGIANA (Crosse). PL 48, figs. 4, 5, 6. 



Shell similar to U. elliotti, from which it differs in the 

 following characters : It is more lengthened, and tapers more 

 gradually; there are more whorls, 33 or 34 (to about 40, 

 according to Poey) ; the last third or half of the last one free 

 and descending. The ribs are less elevated and less trian- 

 gular, and extend further up the spire. 



Length 27.5-31, diam. 3 mm. 



Western Cuba: Paso-Real de Guane (Elliott et al). 



Cyl. elliotti var. b, POEY, Memorias, ii, p. 37, pi. 5, f. 3, 4. 

 PFR., Novit. Conch., pi. 100, f. 23, 24. SOWERBY, C. Icon., xx, 

 pi. 6, f. 47 b. C. dautzenbergiana CROSSE, Journ. de Con- 

 ehyl., 1890, p. 212, pi. 4, f. 6. PILS. & VAN., Proc. A. N. S. 

 Phila. 1898, p. 276, pi. 18, f. 18 (axis). 



Readily distinguished from U. elliotti by the more gradu- 

 ally tapering spire and free, descending last whorl. In a 

 large series of both species these differences are constant, 

 and support Crosse 's opinion of the specific value of U. daut- 

 zenbergiana. It is named for one of the present editors of 

 the Journal de Conchyliologie. For the dentition see p. 110. 



Section Liocallonia Pilsbry, 1892. 



Callonia, somewhat smooth species, PILS. & VAN., Proc. 

 A. N. S. Phila. 1898, p. 276. 



Urocoptis with three axial lamellae, the upper one thin, 

 decidedly the largest of the three in the median whorls; the 

 lower one denticulate or spinose. Surface smoothish, striate 

 or with thread-like rib-striae. Type U. vincta. 



The dentition of U. vincta (pi. 63, fig. 1) does not differ 

 materially from that of U. elegans, etc. The lateral teeth 

 decrease in size very slowly, only the outermost two or three 

 being noticeably shortened. The ectocones are large, and the 

 teeth crowded. It is for the genus a normal and unspecial- 

 ized radula. The shell is also relatively unspecialized, the 

 sculpture being of primitive type, and the last whorl but 

 shortly free. 



This series is akin to the group of U. angustior, being dif- 

 ferentiated therefrom only by the invariable presence of three 



