42 SPIRAXIS. 



Another specimen (pi. 4, fig. 53) differs from the type 

 by having the grooves much more widely and irregularly 

 spaced on the last whorl, as in S. Iceviusculus. It has the 

 other characters of .8. parallelus, and may for the present be 

 considered a form of that species. 



43. S. MICANS (C. B. Adams). PL 3, fig. 35. 



' * Species similar to A. levis, but the shell is less elongated, 

 the outlines of the spire are more convex, the aperture is 

 shorter, and the columella is more twisted and not arcuate. 

 Mean divergence 17 degrees. Length .41, breadth .115, length 

 of aperture .12 inch." (C. B. Ad.). 



Jamaica. 



Achatina micans C. B. A., Contrib. to Conch, no. 2, p. 26 

 (Oct., 1849). PER., Monogr. iii, p. 502. Spiraxis micans 

 Chitty, Oontrib. to Conch, p. 15. 



There is a single specimen (fig. 35) in the Adams collec- 

 tion at Amherst, closely corresponding to Adams's measure- 

 ments, and doubtless the type. It is subulate, pale brown- 

 ish corneous, translucent, showing the white axis through. 

 The polished surface is sculptured with close and nearly re- 

 gular impressed grooves, slightly arcuate and a little more 

 emphatic near the suture above, extending from suture to 

 suture. On the last whorl the grooves weaken or almost 

 fade out on the base, and on the later fourth of the whorl 

 they are weaker and more widely spaced. There are about 

 six striae in the space of a mm. on the face of the last whorl. 

 The first 21,4 whorls are smooth. The spire tapers regularly 

 to the obtuse, rounded apex. The second whorl looks dis- 

 proportionately large. Aperture slightly oblique, the outer 

 lip receding above and below, arching forward in the middle. 

 It has the smooth finish of 'an adult shell. Columella white, 

 cord-like, moderately sinuous. Length 9.8, diam. 2.9, aper- 

 ture 3 mm. ; whorlsi 6%. 



The aperture, being slightly foreshortened in the figure, ap- 

 pears wider than it actually is. 



44. S. CALUS Pilsbry, n. sp. PI. 3, figs. 33, 34. 



The shell tapers regularly, is subtranslucent, showing the 



