112 UROCOPTJS. 



Compared with Holospira, Urocoptis shows many important 

 differences in the soft anatomy, besides the divergence in jaw 

 and dentition already exposed by Fischer and Crosse. The 

 free retractor muscles differ in the much shorter union of the 

 right ocular and columellar bands in Urocoptis, while the left 

 and pharyngeal bands, united in Holospira roemeri, are inde- 

 pendent in Urocoptis brevis. The penis has a normal re- 

 tractor in Holospira, but in Urocoptis its annexation to the 

 ocular band reminds one of the condition obtaining in many 

 Acliatinidcc. 



I regret that I have not been able to obtain any of the 

 larger species of Jamaica, Haiti or Cuba in condition for dis- 

 section. The above descriptions are based upon three speci- 

 mens of the rather small U. brevis, kindly supplied alive by 

 Mr. G. H. Clapp. The shell has to be removed with dilute 

 acid, after which the manipulation is not difficult except for 

 the tight coiling of the whorls. 



Subdivisions of Urocoptis. 



Subgenus UROCOPTIS Beck. 



Central teeth of the radula extremely narrow; lateral teeth 

 almost uniform in size and shape, only a few of the outer- 

 most shortened and diminished. Shell brown, pink or purple, 

 uniform, or with a sutural band, regularly striate, the axis 

 slender and straight or rarely thickened by a low, wide spiral 

 cord. Jamaica. 



Section Spirocoptis Pils. Shell rather large ; axis distinctly 

 twisted or encircled by a smooth, low, obtuse spiral plait. 

 Type U. sanguinea. 



Section Urocoptis Beck. Shell rather large; axis slender, 

 straight and simple. Type U. cylindrus. 



Section Bactrocoptis Pils. Shell small and slender; axis 

 simple and thin. Type U. rosea montana. 



Subgenus AUTOCOPTIS Pilsbry, 1902. 



Central teeth of the radula wide, approaching the ectocones 

 of the laterals in width. Shell rather large, capacious, the 

 iixis straight and simple, its base encircled in the last whorl 



