genus Cryptostoma. So striking is the resemblance that 

 I have hesitated much to consider it a distinct species. 



The chief differences appear to be, that the present spe- 

 cies has more general convexity and the spire itself is 

 slightly convex: beneath, the breadth is less considerable 

 between the outer margin and the edge of the mouth, and 

 the revolutions of the spire within are much more obvious. 



REFERENCE TO TKE PLATE. 



The upper and lower figures are the superior and inferior views. 

 PLATE XXV. 



SIGARETUS MACULATUS. 



SPECIFIC CHARACTER. 



Shell with two maculated bands, 



DESCRIPTION. 



Shell oval, depressed, with very numerous, transverse, 

 hardly undulated, subequidistant, impressed lines, and lon- 

 gitudinal wi'inkles ; the transverse lines are obsolete be- 

 neath ; two bands of pale rufous spots, and a rufous band 

 near the suture : spire hardly prominent, slightly convex : 

 volutions about three ; suture a simple impressed line : ap- 

 ature very large. 



