178 UROCOPTIS, S. G. COCHLODINELLA. 



Cylindrella jejuna OLD., Proc. Bost. Soc. N. H., ii, 1848, 

 p. 41 ; Terr. Moll. U. S., ii, p. 310 ; iii, pi. 69, f . 3. 



U. p. variegata differ from typical poeyana in the less fusi- 

 form shape, generally more broadly truncate apex, and espe- 

 cially in the much more distinct basal carina. The white 

 streaks are not a very constant feature. Figure 81 of plate 

 42 represents a Matanzas specimen. Gould's type of C. 

 lactaria (pi. 42, fig. 80) was also from this place. It is a far 

 more common shell in collections than U. poeyana. The 

 length of Matanzas shells ordinarily varies from 11 mm. with 

 9!/2 whorls to 16 mm with 11 whorls. 



At Marianao Mr. Rhoads collected numerous rather large 

 specimens, normally truncate adults measuring length 15 

 mm. with IQi/o whorls to 12 mm. with 9% whorls. 9y> whorls 

 are cut off in adult shells. At Carmelo the shells were 

 smaller, length 11 mm. with 8 l /2, to 8% mm. with 1% whorls. 



Floridian specimens from Miami (fig. 82) are either cor- 

 neous-white or brown, with white striae and with or without 

 some white maculation. They are usually broadly truncate, 

 with about 8y 2 whorls remaining, the basal keel rather strong. 

 The peristome is either shortly free or rarely adherent above. 

 In rare cases where the abandoned early whorls have not 

 broken off there are 17 to 19y 2 whorls, the first one smooth 

 and translucent, very rapidly widening, next several whorls 

 narrower, so that the tip is bulbous. The size varies a good 

 deaL 



Length 15.5, diam. 2.8 mm.; whorls 19y 2 (apex entire). 



Length 12.5, diam. 2.8 mm.; whorls 17 (apex entire). 



Length 12.5, diam. 3.2 mm.; whorls 9 (truncate). 



Length 9.5, diam. 2.8 mm.; whorls 7i/ 2 (truncate). 



Length 9.5, diam. 2.5 mm.; whorls 8 (truncate). 



The white maculation typical of variegata is frequently 

 developed; the lip is thin, well expanded and somewhat 

 reflexed. 



At Key West, Fla., the shells have a much thickened peri- 

 stome, and the axis is usually perceptibly twisted. 



Var. jejuna (Old.). PL 42, figs. 83, 84. 



Smaller, the neck longer. Length two-fifths, diam. one- 



