70 VARICELLA. 



15. V. OBCULANS (C. B. Adams). 



"Shell conoidal, but very slender; dull horn color; with 

 about fourteen transverse oblique rather prominent laimelloid 

 ridges, which are somewhat arcuated with the convexity for- 

 wards : apex rather obtuse : spire with the outlines rectilinear, 

 except near the apex : whorls nine, flattened or concave along 

 the middle, with a well impressed suture: aperture ovate, 

 very narrow and acute above, retreating much below on both 

 sides: columella subsipiral, distinctly truncated in a young 

 shell, indistinctly so in an old one, with the edge somewhat 

 dilated, so as to resemble a Spiraxis. Mean divergence about 

 9; length of spire .28 inch; total length .35 inch; breadth 

 .06 inch." [8.75 x 1.5 mm.] . (Adams). 



Jamaica (C. B. Adams). 



Achatina osculans C. B. A., Contrib. to Conch, no. 7, p. 

 104 (April, 1850). 



I did mot find this species in the Adams collection at 

 Amherst. Cf. V. mandevillcnsis. 



16. V. MANDEVILLENSIS n. sp. PL 12, figs. 6, 7 ; pi. 14, fig. 28. 



The shell is very slender, pale brown or almost corneous, 

 thin, composed of about 8 l / 2 moderately 'convex whorls parted 

 by a deeply cut suture. The first 2% whorls are embryonic, 

 first % whorl smooth, the next 2 obliquely striate, the stris 

 smooth and about the width of the intervals. The rest of the 

 whorls have widely spaced, slender and acute ribs, 12 or 13 

 on the last whorl, 'weakening below and obsolete at the base. 

 There are also two low sigmoid varices. The intervals have 

 a silky appearance, being sculptured with 35 to 40 minute, 

 thread-like strise. The aperture is quite -oblique, piriform, 

 the basal margin retracted. Parietal margin slightly con- 

 vex ; icolumella somewhat concave, and weakly, obliquely trun- 

 cate at the base. Axis (pi. 14, fig. 28) spirally ascending, 

 a central hole or "false umbilicus" being more or less obvious 

 in a basal view. Length 9.9, diam. 2 mm., whorls 8%. 



Jamaica: Mandeville (J. B. Henderson). 



This beautiful species is closely related to T 7 . gracilior in 

 sculpture and shape, but differs by its spirally ascending 



