SPIROSTEMMA. 297 



Cylindrella (Anoma) abnormis VEND., Nautilus xv, p. 3, 

 pi. 1, f. 5, 6 (May 1, 1901). 



Described from a single specimen in coll. Vendryes, possi- 

 bly a pathologic S. tenella. The name has been used for 

 a Cuban form but not denned, so this Jamaican form need not 

 be renamed. 



15. S. PUSILLA (C. B. Adams). PL 37, figs. 84-87. 



Shell very small, narrowly fusiform, widest in the middle, 

 tapering towards both ends, pale brownish corneous. Striae 

 delicate and narrower than the intervals. Whorls 7 to 8, 

 moderately convex, the last angular around a very narrow 

 concave basal area. Aperture very oblique, rounded; peri- 

 stome obtuse, slightly expanded, the upper margin adnate 

 to the preceding whorl. Internal axis strongly spiral in the 

 last tw r o whorls, showing a wide corkscrew spiral when viewed 

 from the base, in the aperture. Length 6, diam. 1.6 mm. 



Jamaica: Aenon Town, St.. Ann (P. W. Jarvis). 



Cyl. pusilla C.B.A., Contrib. no. 7, p. 102 (April, 1850). 

 -PpR., Monogr., iii, p. 581. 



The smallest member of this group. It is related to 

 S. tenella, but differs by its smaller number of whorls and 

 shorter, more fusiform contour. 



