VARICELLA, JAMAICA. _ 83 



diam. 5; aperture 6.1 mm., whorls 8%. The constriction of 

 the last whorl is confined to its later half. Each of the last 

 three whorls has three narrow 'brown streaks. The first half 

 whorl at the apex is smooth. The outer lip is prominent 

 'below the middle, but is not angular there, and projects for- 

 ward less than in V. griffithii ischna. This is the chief dis- 

 tinction between the two forms. The columella in ligata is 

 vertical, nearly straight, .curving into the parietal wall above, 

 and obliquely truncated fbasally. Tryon's figure intended 

 for V. ligata was drawn from a specimen of V. griffithii 

 ischna. 



There is a small, pale corneous form, with very incon- 

 spicuous brown streaks, and a deep and conspicuous concave 

 zone around the whole last whorl. Specimens from Mjande- 

 ville (Henderson coll.) are figured, pi. 8, figs. 33, 34, 35. 

 One measures, length 15, diam. 4.7, 'aperture 6 mm., whorls 

 7%. 



Another form in the Adams collection is larger, more ro- 

 bust than typical V. ligata, with slightly coarser striation. 

 Length 20.7, diam. 6.5, aperture 8 mm., whorls 8% (pi. 8, 

 fig. 36 ; pi. 11, fig. 57) . This form differs from V. griffithii 

 and its varieties by the depressed, concave zone of the last 

 half of the last whorl, and the curved but not angular outer 



HP. 



Group of V. philippiana. 

 29. V. PHILIPPIANA (Pfeiffer). PI. 8, figs. 21-27. 



The shell is whitish-corneous, boldly painted with reddish- 

 brown stripes, widest above, and interrupted in the middle 

 on the last whorl. There are generally 3 to 5 of these broad 

 stripes on the last whorl. The first whorl is smooth; rib- 

 striae then appear, becoming gradually stronger and coarser. 

 At the end of 3y 2 whorls there is a streak and varix, prob- 

 ably indicating the extent of the embryonic shell (fig. 24). 

 The rib-striae are very regular and beautiful on the later 

 whorls, the riblets -and intervals being equal. On the last 

 there are about 3 riblets in a mm. The whorls, especially 

 the last, iare swollen just below the suture. The last whorl 



