154 Panama Shells, 



200. Cerithium irrorafum. 



Synonymy:. 



Cerithium irroratum Gould in Proc. Best. Soc. Nat, Hist, 



IE, 119. Feb. 1849, 

 Gould Exped. Shells, p. 61. Feb. 1849, 



This species closely resembles (J. oceUatum Brug., but Dr. 

 Gould informs me that it is his C. irroratum. 



Station. At and above half tide level - r mostly in the margin; 

 of water left on the rocks by the tide. 



Habitat. -Unknown ; Gould, in Exped. Shells. 



Mazatlan ; Lt. Green ! Gould MSS, 



Panama and Taboga ; C. B. A. ! 

 Eight hundred and twenty specimens were collected. 



201. Cerithiwni iiegicctiim. Nov. sp. 



Shell long, ovate conic : blackish red, with the apex white : 

 with three prominent spiral ridges on each whorl, of which 

 the upper two are less distant ; with prominent transverse 

 ridges, sixteen or eighteen on the last whorl, where they are 

 less robust than on the spire, and which become obsolete on 

 the periphery of the last whorl ; with the intersections developed 

 into very prominent elegantly rounded nodules ; anteriorly 

 with two additional subgranulous spiral ridges ; apex acute : 

 spire with curvilinear outlines : whorls ten, moderately convex ? 

 with the suture indistinct ; last whorl rather short : aperture 

 obliquely subovate : labrum a little modified by the spiral 

 ridges : canal deep 7 very short. 



Mean divergence about 20 ; length .125 inch ; breadth .04 

 inch ; length of spire .09 inch. 



Station. Under stones, in old shells, in dead sponges, &c., 

 aear low water mark. 



