VARICELLA, JAMAICA. 73 



Section VARICELLULA Pilsbry, n. sect. 



Slender, mostly small Varicellas with even sculpture of 

 close rib-striae, and straightened columella with weak, oblique 

 basal truncation. There are about 2% embryonic whorls, the 

 first l /2 to 1.1/2 whorls smooth; outer lip simply arcuate. 

 Type V. blandiana. 



These forms resemble Pichardiella by their slender contour, 

 weak columellar truncation and accelerated sculpture, which 

 has extended over the greater part of the embryonic shell; 

 but they differ by the even, homogeneous sculpture of the 

 neanic and adult stages, more like Varicella s. str. All the 

 species are Jamaican. 



Key to species. 



I. Shell about 22 x 6 mm., sculptured with rather coarse rib- 

 striae as wide as their intervals, nearly 5 in one mm. on 

 the last whorl. V. costulosa, no. 25. 



II. Small, thin and delicate forms, less than 16 mm. long, 

 with 7 to 10 striae in one mm. on the last whorl. 



a. Shell corneous, without dark streaks, with sculpture 

 of even low rounded riblets wider than their inter- 

 vals; about 7y 2 whorls, the first 1% smooth. 

 &. About 7.8 x 2 mm., 10 riblets in one mm. 



V. tenem, no. 24. 

 6 1 . About 8.5 x 1.9 mm., 7 riblets in one mm. 



V. t. roperi, no. 24a. 



a 1 . Shell with dark varix-streaks or subsutural spots, 

 10 to 16 mm. long. 



&. Riblets 7 in one mm., separated by spaces twice 

 as wide as the riblets. V. proxima, no. 22. 



6 1 . Riblets as wide as the intervals or wider. 



c. Suture puckered, the riblets arcuate be- 

 low it, about 9 in one mm. 



V. blandiana, no. 21. 



c 1 . Suture simple, the riblets straight, about 

 7 in one mm. 



