VAEICELLA. 51 



form, and decrease in size very slowly towards the edges of 

 the radula. The teeth are excessively minute, far smaller 

 than in any other Oleacinidae I have examined. The slight 

 olbliquity of the transverse rows contrasts with other known 

 forms, in which they are as a rule strongly oblique. 

 The species are distributed as follows: 



Cuba, species 1 to 7. 



Southern Florida, species 3a. 



St. Thomas, species 36. 



Haiti, species 8. 



Jamaica, species 9 to 17. 



Trinidad ( ?) species 18. 



Panama ( ?) species 19. 



Keys to the Cuban (p. 51) and the Jamaican species (p. 62) 

 will be found in the text. 



Cuban species. 



The east Cuban species scalamna, tuberculata and multi- 

 costa are not known to me by specimens ; the descriptions and 

 figures are crude; therefore no satisfactory key to species 

 >can yet be framed. 



I. Surface distinctly striate spirally; usually with dark 

 streaks. 



a. Ribs angular or spinose at the shoulder; shell with 

 streaks. 



&. East Cuba; closely striate, with remote ribs; 

 8.3 x 2.6 mm., whorls 7. 



V. tuberculata, no. 6. 



6 1 . W. Cuba; ribs produced in hollow spines at the 

 Shoulder, obsolete or wanting at the base ; inter- 

 costal reticulation weak; 12.8 x 4 mm. 



V. a. horrida, no. 1&. 



6 2 . Short spines at shoulder and smaller ones be- 

 low periphery, more slender, 8y 2 whorls. 



V. acuticostata, no. 1. 



6 3 . Last whorl less distinctly biangular, with only 

 weak traces of spines, 13 to 16 waved strise in 

 each interval ; 13.8 x 3.6 mm., with 10 whorls. 



Y. a. filipensis, no. la. 



