74 



Mean divergence about 12°; length of spire .09 inch ; total length 

 .115 inch; breadth .04 inch. 



Chemnitzia exilis. Shell very slender : white : with about fif- 

 teen to eighteen stout transverse ribs, which terminate just below the 

 convexity of the last whorl ; with numerous spiral strioe in the inter- 

 costal spaces, but not anteriorly ; with the intercostal spaces on the 

 last whorl anteriorly depressed below the adjacent surface of the an- 

 terior region : nucleus with about one and one-half smooth whorls, 

 nearly at right angles to the rest of the shell : spire with rectilinear 

 outlines : whorls ten besides the nucleus, planulate, with a moderately 

 impressed suture : aperture rather short, subelliptical : labium scarce- 

 ly thickened : umbilical region scarcely indented. 



Mean divergence about 10°; length of spire .145 inch ; total length 

 , .165 inch ; breadth .037 inch. 



Chemnitzia pusilla. Shell very slender : white : with about 

 twelve rather stout transverse ribs, which are not produced below the 

 convexity of the last whorl ; without spiral striae ; with the intercos- 

 tal spaces on the last whorl depressed anteriorly below the adjacent 

 surface of the anterior region, which is smooth : nucleus consisting of 

 about one and one-half smooth whorls, very oblique : spire with rec- 

 tilinear outlines : whorls ten or eleven besides the nucleus, moderately 

 convex, with a well impressed suture : aperture ovate : labium not 

 perceptibly thickened: umbilical region scarcely indented. This 

 species resemble C. levis. 



Mean divergence about 8°; length of spire .11 inch; total length 

 .135 inch; breadth .03 inch. 



Chemnitzia flavocincta. Shell moderately elongated : white, 

 with a broad spiral band of yellowish brown along the suture : with 

 about twenty-eight transverse well rounded rather slender ribs, which 

 become obsolete on the anterior surface; with excessively minute 

 spiral striai, in the intercostal spaces, coarser and traversing the ribs 

 on the anterior region : nucleus consisting of about one and one-half 

 smooth whorls, very oblique : whorls eight or nine, besides the nucleus, 

 slightly convex below the middle, slightly shouldered, with a dis- 

 tinct suture : aperture rather small, elliptical : labium moderately 

 thickened : umbilical region scarcely indented. 



Mean divergence about 12°; length of spire .11 inch; total length 

 .145 inch ; breadth .04 inch. 



Chemnitzia multicostata. Shell moderately elongated : white, 

 or tinged with yellowish brown : with about thirty-four to thirty-eight 



