XXXV111 KEY TO UROCOPTID^E. 



with a wide callous band or double cord bearing ob- 

 lique nodes or riblets. Eastern Cuba. 



Idiostemma, xv, p. 164. 



V. Axis slender, coiled corkscrew-like around a central space 

 in the later whorls or the last one. 



1. Shell pillar-shaped or cylindric-fusiform, widely trun- 

 cate, brown or reddish, evenly striate; last whorl but 

 shortly or not free, strongly carinate below, the keel 

 bounding a concave basal area. Aperture rounded- 

 ovate, the lip adnate above or free, continuous. Proto- 

 conch ribbed. Jamaica. Spirostemma, xv, p. 284. 



2. Shell fusiform, slender, with moderate or long descend- 

 ing neck and circular aperture; apex smooth when 

 present. Eastern Cuba, Santo Domingo. 



Gyraxis, xvi, p. 58. 



VI. Axis slender and straight (usually arcuate in the last 

 whorl), or weakly twisted spirally; without lamellae, ribs 

 or spines. 



1. Peristorne continuous, free, or rarely adherent above. 

 a. Shell sinistral, slender, white, the axis very slen- 

 der; last whorl shortly free or adnate, with a cord- 

 like basal keel; aperture longer than wide. 



Apoma, xvi, p. 106. 



a 1 . Shell dextral; aperture not noticeably longer than 

 wide, usually subcircular ; last whorl rounded, 

 II though sometimes having a basal keel. 



&. Rather large species of stout figure, the last 

 whorl only shortly free or adnate. 

 c. Shell red, purple or brown, rarely white, 

 uniform or with a sutural band; truncate, 

 the plug long, curved and tongue-shaped. 

 Jamaica. Urocoptis, s. str., xv, p. 121. 



c 1 . Shell variously colored, often light or varie- 

 gated ; last whorl with a strong basal carina; 

 an accessory lamina encircling the axis in 

 the last whorl, sometimes united with it; 

 plug flat or shortly tongue-shaped, an empty 

 whorl often persisting above it. Haiti. 



Autocoptis, xv, p. 147. 



