SPIRAXIS. 41 



This delicate species resembles the smaller forms of S. 

 Iceviusculus in shape, but differs by its very regular and close 

 sculpture, recalling the much larger S. micans. There are 

 specimens in the C. B. Adams collection at Amherst labelled 

 S. aberrans var. and others from two sources in the collec- 

 tion of the Academy, all very similar in size, color and 

 sculpture. 



41a. S. PERSTRIATUS var. ERRANS n. var. PI. 3, fig. 39. 



The shell is excessively similar to penstriatus, but differs 

 by its shorter aperture, which is wider below. It is corneous, 

 with very pale brown, streaks, two on the last and two on the 

 penult whorl. First 1% whorls smooth, the rest closely and 

 regularly grooved, the grooves arcuate, obsolete on the base 

 of the last whorl, and about 10 in number in one mm. on the 

 front of the last whorl. Length 3.8, diam. 1.2, length of 

 aperture 1.4 mm. ; whorls S 1 /^. 



Haiti: Sans Souci, near Cape Haitian (J. B. Henderson). 



42. S. PARALLELUS Pilsbry, n. sp. PI. 4, figs. 52, 53. 



The shell is very narrow, cylindric-turrite, whitish-corneous 

 with (in the type) two very faint brownish streaks on the 

 last whorl. Surface polished, regularly sculptured with 

 linear, slightly arcuate grooves parted by much wider flat- 

 tened intervals; the grooves obsolete on the base of the last 

 whorl. First 2*4 whorls smooth. There are about ten 

 plaits in a mm. on the front of the last whorl. Apex obtuse. 

 Whorls almost 6, the earlier ones moderately convex, the last 

 with, almost straight parallel sides- and convex base. Suture 

 very deeply impressed, narrow. Aperture small, narrowly 

 piriforni, the basal margin receding. Outer lip arched for- 

 ward above the middle. Columella delicate, cord-like, rather 

 weakly sinuous. Length 4.7, diam. 1.25, length of aperture 

 1.6 mm. 



Jamaica (A. D. Brown coll., A. N. S. P.). 



Peculiar for its narrow, compressed shape, regular close 

 grooves and piriform mouth. It is narrower than S. per- 

 siriatus, with a relatively smaller aperture, of a different 

 shape. 



