40 SPIRAXIS. 



young of 8. procerus. While the three specimens may per- 

 haps not be fully adult, yet they are referable to no described 

 Jamaican form, which I have seen, corning nearest, perhaps, 

 to 8. brevis Ad. 



40. S. BREVIS C. B. Adams. 



"Shell long-ovate; pale horn color, translucent; shining, 

 smooth anteriorly, otherwise with rather numerous micro- 

 scopic strife ; spire with the outlines moderately convex, with 

 a well impressed suture; aperture ovate; lab rum thin and 

 sharp ; columella with the edge moderately projected into the 

 aperture. Mean divergence about 20 ; length .19 inch ; 

 breadth .07 inch; length of aperture .08 inch." (Adams). 



Jamaica (Ohitty coll.). 



Spiraxis brevis C. B. A., Contrib. to Conch, no. 9, p. 168, 

 in Ann. N. Y. Lye. Nat. Hist, v, p. 92. (April, 1851).- 

 PFR., Monogr. iii, 471. 



The type of this species was not found in the Adams col- 

 lection, and is probably in that of Chitty. It seems distinct 

 from the other forms by its comparatively long aperture, 

 nearly half the length of the shell, which measures, accord- 

 ing to Adams, 4.75 x 1.75 mm., aperture 2 mm. 



41. S. PERSTRIATUS Pilsbi'v, 11. sp. PI. 4, figs. 47, 48. 



The shell is narrowly turrite-fusiform, uniform pale cor- 

 neous, somewhat translucent. 'Surface polished, regularly 

 sculptured with linear vertical grooves parted by much wider 

 flattened intervals. On the last whorl the grooves gradually 

 weaken below the periphery and become obsolete on the base. 

 First 1% whorls smooth. There are about 8 or 9 plaits in 

 one mm. on the front of the last whorl. Apex obtuse. 

 Whorls 51/2, convex, separated by a deep suture. Aperture 

 very narrowly piriforrn, slightly oblique, the peristome being 

 retracted below; outer lip arched forward above the middle, 

 retracted to the upper insertion. Columella cord-like, rather 

 strongly spiral above. Length 4.4, diam. 1.3, length of aper- 

 ture 1.6 mm. 



Jamaica (Swift coll., A. N. S.). 



