72 



sali<l. A variety of coloring has all the shell black except on the 

 upper third of the whorls and on the anterior part. A variety of 

 sculpture and coloring has the striai enlarged nearly to the width of 

 the intervening ridges, and is mostly black with spirally elongated 

 spots of white on the ridges. 



Mean divergence 58° ; length of spire .36 inch; total length .72 

 inch ; breadth .44 inch. 



Chemnitzia latior. Shell moderately elongated: white: with 

 about twenty to twenty-four prominent transverse ribs, the ends of 

 which mostly alternate at the suture, and which are produced on the 

 last whorl into the umbilical indentation : with numerous crowded 

 spiral striae, which ascend the sides of the ribs without being produc- 

 ed over their summits : nucleus consisting of about one smooth glob- 

 ular whorl, with its axis nearly at right angles to the axis of the shell : 

 spire with the outlines a little convex : whorls about nine after the 

 loss of the nucleus, slightly convex, with a distinct suture : aperture 

 obliquely ovate, acuminate above : labium much thickened : umbili- 

 cal region moderately indented. 



Mean divergence 22"; length of spire .165 inch; total length .215 

 inch; breadth .065 inch. 



Chemnitzia PUNCTA. Shell mucli elongated : white: with about 

 twenty-six to thirty 'rather prominent transverse ribs, which are not 

 produced below the convexity of the last whorl ; with numerous 

 crowded spiral strite in the intercostal spaces, one of which strise, a 

 little above the middle of the whorls, and another along the suture are 

 wide and deep, resembling spiral series of punctures ; intercostal 

 spaces depressed anteriorly below the adjacent anterior surface : 

 spire with the outlines rectilinear : whorls ten or eleven, after the loss 

 of the nucleus, scarcely convex, with a distinct suture : aperture ovate- 

 rhombic : labium scarcely thickened : umbilical region scarcely in- 

 dented. 



Mean divergence about 16° ; length of spire .185 inch ; total length 

 .22 inch ; breadth .05 inch. 



Chemnitzia obeliscus. Shell much elongated: white: with 

 twenty-six to thirty transverse prominent ribs, which are not produc- 

 ed below the convexity of the last whorl ; with numerous crowded 

 spiral strias in the intercostal spaces, and a little above the middle of 

 the whorls a broad smooth depressed spiral line, and similar lines on 

 the middle and anterior of the last whorl : spire with the outlines 

 rectilinear : whorls eleven after the loss of the nucleus, planulate, 



