93 



rirlges crossed by many microscopic spiral impressed lines ; with a 

 crowded sutural series of sharp crenulations : spire long, with the out- 

 lines moderately curvilinear : apex truncate with the loss of 



whorls : a little more than five whorls remaining, with a moderately 

 impressed suture : aperture ovate, rather large and spreading, a little 

 modified by the penult whorl: peritreme single, scarcely reflected to 

 the plane of the aperture, on the left side appressed to the penult 

 whorl: umbilicus small, with strong spiral striae. This beautiful spe- 

 cies receives the appropriate name suggested by Mr. Chitty. 



Mean divergence 32^^ ; length .82 inch ; greatest breadth .45 inch; 

 least breadth .33 inch. 



Cyclostoma Griffithianuji. Shell ovate-conic, much elonga- 

 ted : with four to six spiral frequently interrupted lines of dark 

 brown, on a ground of very pale reddish brown between, — and whit- 

 ish on tlie summits of — the transverse ridges : with crowded fine 

 transverse raised lines ; anteriorly with feeble concentric striae : spire 

 rather long, with the outlines moderately curvilinear : apex truncate 



with the loss of whorls : whorls remaining five, convex, with a 



well impressed suture : aperture ovate, rather acute above : peri- 

 treme simple, moderately exjjanded and reflected, minutely auriculate 

 above : umbilicus small. 



Mean divergence about 30*^ ; length .55 inch ; greatest breadth .28 

 inch ; least breadth .25 inch. 



CvCLOSToMA GRANOSUM. Shell long ovate-conic : dingy white, 

 with some irregular brown spots next below the suture, with a faint 

 spiral l»nd of the same anteriorly, reddish brown near the end of the 

 last whorl : surface granosely decussated by numerous small trans- 

 verse and spiral ridges, of which the latter commence on the second 

 w horl from the truncated summit : spire with the outlines moderately 

 convex : whorls remaining after truncation four and one-half, quite 

 convex, with a rather deep suture : aperture nearly circular, with the 

 left half of the outline compressed ; inner peritreme moderately pro- 

 duced : outer peritreme thick, narrow, with the margin reflected be- 

 hind the plane of the aperture : umbilicus small, extending through 

 the truncated summit. 



Mean divergence about 33°; length G inch ; greatest breadth .37 

 inch ; least breadth .3 inch. 



Helicina dubiosa. Shell globose-conic: shining, reddish brown, 

 with the lip and callus yellowish white : with excessively fine striae of 

 growth, and very lightly iinpre3.?ed microscopic spiral stride : apex 

 2 



