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 8. tenella. The name has been used for 

 a Cuban form but not defined, 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- 

 stomo obtuse, slightly expanded, the upper margin adnate 

 to the preceding whorl. Internal axis strongly spiral in the 

 last two 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). 

 PFR., Monogr., iii, p. 581. 



The smallest member of this group. It is related to 

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

 shorter, more fusiform contour. 



