106 UROCOPTIS. 



Jamaican snails. Mr. Henderson with the greatest gene- 

 rosity placed his whole collection, the results of two journeys 

 to Jamaica, at my disposal. Having at my hand the results 

 of the studies of two specialists upon the Jamaican fauna, 

 the following account has been made much more complete 

 than would otherwise have been possible. 



Genus UROCOPTIS Beck, 1837. 



Urocoptis BECK, Index Molluscorum, p. 83, for petiveriana 

 Fer. ; blainvilleana Fer. ; cylindrus Ch., Dw. and Wood ; rosata 

 Fer. ; glandula B., abbreviata B., coarctata B., Lister H., xxi, 

 17; truncatula Lam. ( da us ilia) ; gracilicollis Fer. J. E. 

 Gray, Proc. Zool. Soc. Lond., 1847, p. 177, Turbo cylindrus 

 selected as type. PILSBRY & VANATTA, Proc. Acad. Nat. Sci. 

 Phila., 1898, pp. 267, 270, 27.Cochlodina FER,, Tableau 

 System, etc., pp. 24, 61 (1822?) in part. Cylindrella PFR., 

 Archiv f. Naturgeschichte, 1840, p. 41, in part. 



Shell lengthened, either cylindric, fusiform or oval, usually 

 losing the early whorls in adult life; whorls usually numer- 

 ous, narrow and slowly widening, compactly coiled around an 

 imperforate columellar axis. Jaw delicate, arched, composed 

 of numerous plaits. Radula with teeth in V-shaped rows, 

 the centrals small, side teeth all of the same general form, 

 gradually decreasing from the inner to the outer, having 

 large, gouge-shaped mesocones and large posterior cusps 

 (ectocones). Type U. cylindrus. 



Distribution, Jamaica, Haiti and Cuba, with a single spe- 

 cies in southern Florida. 



This genus has usually been known as Cylindrella, owing 

 to the use of that name by Dr. L. Pfeiffer who for thirty years 

 or more, in the middle of the last century, was justly held to 

 be the chief authority in the world on land snails. The name 

 Urocoptis ("cut tail," in allusion to the truncation of the 

 spire) was proposed several years earlier than Cylindrella, 

 for the same group, by IT. Beck, also a naturalist of marked 

 genius in taxonomic studies. The list of species cited by 

 Beck as components of his new group included no less than 

 six imdcscribcd forms, the first recognized species of the num- 



