92 VARICELLA, JAMAICA. 



b. Subarcuately closely costulate; 13x3.5 mm. 



with 9 whorls. V. arcuata, no. 46. 



& 1 . With excessively minute crowded striae; 13 x 



3.75 mm., 8 whorls. V. solitaria, no. 47. 



b 2 . With irregularly spaced grooves; 24x6 mm. 



or smaller. V. similis, no. 48. 



IV. Outer lip arcuate; :a false umbilicus visible from the 



base; slender pale corneous forms, with faint brown 



streaks or none. 



a. Shell 17 to 18 mm. long, 4 to 4.7 wide, with 8y 2 to 

 9 whorls, sculpture of few very weak, unequally 

 spaced grooves. V. similaris, no. 49. 



a- 1 . 11.25 by 2.25 mm., 10 whorls; very lightly im- 

 pressed stride, not very numerous. 



V. longispira, no. 50. 



a 2 . 11 x 2.8 mm., whorls 7% ; very few weak impressed 

 lines on the smooth surface. V. levis, no. 51. 



a- 3 . Smaller, less than 8 mm. long, less than 2 mm. wide. 

 b. Post-embryonic whorls all closely and regu- 

 larly grooved. 



c. About 30 grooves on the last whorl; 6.8 

 x 1.5 mm., with 7 whorls. 



V. clappi, no. 53. 



c 1 . About 25 grooves on last whorl, obsolete 



on periphery and base; false-umbilicus 



very wide; 5.3x1 to 5.9x1.2 mm., with 



7% whorls. V. cochlidium, no. 54. 



ft 1 . Third and fourth whorls with rather close, 



regular grooves, the last 2 whorls with widely 



spaced grooves, usually about 9 to 12 on each. 



c. Columella abruptly truncate at base; 6.5 



xl.66 mm. with 6% whorls to 7.3x1.8 



mm. with 7% whorls. 



V. pellucens, no. 52. 



c 1 . Columella deeply concave above, very 

 obliquely ( vertically ) truncate at base; 

 6.3x1.35 mm., with 6% whorls. 



V. spina, no. 55. 



