[122 



anteriorly : aperture suborbicular : canal reduced almost to a broad 

 deep notch. 



Mean divergence about 13°; length of spire .13 inch; total 

 length .16 inch ; breadth .055 inch. 



Cerithium vicinum. Shell similar to C. rugulosum, but in place 

 of the spiral lines are spiral ridges, and in place of the transverse 

 ridges are slender transverse elevated lines, the proportion of size 

 being reversed ; whorls about eight or nine ; the canal is a little 

 more developed. 



Mean divergence about 11°; length of spire .09 inch; total 

 length .12 inch ; breadth .04 inch. 



Cerithium latum. Shell conic above, cylindric below : whitish, 

 with a spiral brown band occupying the suture and the upper spiral 

 ridge, on which however the granules are white : with three spiral 

 ridges, of which the lower one is a little larger, and very small trans- 

 verse ridges, which are developed on the spiral ridges into very large 

 nodules; anteriorly with an additional nodulous ridge: apex acute : 

 spire with the outlines quite curvilinear in the upper three-fifths : 

 whorls seven, of which two are nuclear and smooth, slightly convex, 

 with an indistinct suture ; last whorl nearly as large as the penult 

 whorl, terminating rather abruptly : aperture broadly ovate ; labruin 

 well excurved, moderately thickened : canal very short and wide, 

 nearly straight. 



Divergence in the upper whorls about 40° ; length of spire .07 

 inch ; total length .09 inch ; breadth .038 inch. 



Cerithium flavum. Shell conic, turrited : bright yellowish 

 brown : with three prominent spiral carinae, and about twenty-six 

 less prominent transverse slender ridges, the intersections being fee- 

 bly nodulous; anteriorly with an additional slightly nodulous spiral 

 ridge : apex acute : spire with the outlines nearly rectilinear : whorls 

 about nine, a litttle convex, with a distinct suture ; last whorl termi- 

 nating very abruptly, concave anteriorly : aperture suborbicular : 

 canal extremely short, very wide. 



Mean divergence nearly 20°; length of spire .12 inch; total 

 length .15 inch; breadth .045 inch. 



Cerithium albovittatum. Shell conoid, turrited : light yellow- 

 ish brown, with a spiral white band occupying the two lower spiral 

 ridges : with three spiral ridges, of which the middle one is most 



