148 UROCOPTIS OP HAITI. 



sitions between these two kinds. It is commonly not exposed, 

 the open whorl persisting above it, while in Jamaican forms 

 the whorl is generally broken down to the plug in adult indi- 

 viduals. 



The radula (p. 109) differs strongly from that of the 

 Jamaican species in the far greater width of the central teeth. 



Key to Haitian Species. 



I. Suture simple. 



a. Rather large species, diam. 7-11, length 19-28 mm. 



1. Diam. exceeding one-third the length; swol- 

 len, glossy, whitish and closely striate above, 

 reddish or blue and coarsely striate below, 

 dark brown inside. 25%-28 x 10-11 mm. 



U. gruneri, no. 32. 



2. Diam. exceeding one-third the alt. ; oblong, 

 lustreless, flesh colored, finely, distinctly rib- 

 striate throughout; peristome continuous and 

 free. 25 x 9 mm. U. guigouana, no. 33. 



3. Diam. equal to or exceeding one-third the 

 length ; riblets very strongly arcuate, stronger 

 near the sutures ; flesh colored. 19-23 x 7-8 

 mm. Z7. arcuata, no. 34. 



4. Diam. about one-third the length, more or 

 less; weakly striate; glossy; transparent- 

 whitish, or brown above; peristome adnate 

 above, or almost free. U. sericea, no. 31. 



I. Small ovate-oblong species, length about 15, diam. 

 4 to 5 mm. 



1. Clear reddish-brown, glossy, with close arcu- 

 ate strise and low spiral lirse; peristome con- 

 tinuous. U. tumidula, no. 35. 



2. Brownish flesh-colored, closely thread-costu- 

 late, the riblets wavy; peristome continuous, 



in contact above. U. innata, no. 36. 



II. Suture crenulate or with a bordering series of pits or 



bosses, sometimes very small, and on the upper whorls 



only. 



