120 



larger and more distant, and intermediary spiral striae ; anteriorly 

 with six or seven additional feebly graniilous small spiral ridges ; 

 often (?) with one broad varix on the leftside: apex acute: spire 

 with the outlines rectilinear except in the lower part : whorls about 

 eight (?), a little convex, with a moderately impressed suture ; last 

 whorl large and rather ventricose : aperture subovate, rather acumi- 

 nate at both extremities : labrum rather sharp, much thickened a 

 little behind the edge, feebly striated within : labium with a small 

 prominent callus above : canal very short. 



Mean divergence nearly 40°; length of spire .36 inch; total 

 length .58 inch ; least breadth .25 inch ; greatest breadth .3 inch. 



Cerithium gemmulosum. Shell conoid, turrited : reddish black, 

 sometimes wax-colored on the lower part of the whorls : with three 

 spiral ridges, of which the middle one is more elevated ; and on each 

 whorl about thirty-three small transverse ridges, with the intersec- 

 tions nodulous ; with a fourth ridge which is slightly nodulous at the 

 periphery of the last whorl, anterior to which are only incremental 

 striae: apex acute : spire with the outlines moderately curvilinear: 

 whorls twelve, moderately convex, with a well impressed suture ; last 

 whorl abruptly terminating, concave anteriorly; aperture broadly 

 ovate : labrum very thin, well advanced along the middle : canal 

 very short, nearly straight, with a broad deep notch behind. 



Mean divergence nearly 30°; length of spire .17 inch; total 

 length .21 inch; breadth .08 inch. 



Cerithium exile. Shell conic, turrited, very slender : brownish 

 red, paler at the apex, whitish on the nodules : with one slightly ele- 

 vated and three well elevated spiral lines, and on each whorl about 

 twelve rather large obtuse ridges, the intersections being moderately 

 developed into nodules ; with another spiral well elevated line at the 

 periphery of the last whorl : apex very acute : spire with the outlines 

 rectilinear: whorls twelve to fourteen, quite convex, with a well im- 

 pressed suture; last whorl terminating abruptly, concave anteriorly : 

 aperture suborbicular : canal extremely short, reduced behind to a 

 broad deep notch. 



Mean divergence about 10°; length of spire .085 inch ; total length 

 . I inch ; breadth .03 inch. A fragment consisting of the lower five 

 whorls of a larger shell is .04 inch wide. 



Cerithium fusiforme. Shell ovate-fusiform : reddish black, 



