199 



interstices, and numerous spiral thin laminae traversing 

 the interstices and decussating the ribs on which they 

 form small oblong tubercles ; mouth ovate oblong, the 

 canal very oblique and elongated, i. Aberdeen. 



P. RETICULATA. Brown. Illus. t. 38. /. 43,4. 

 Macgyl. Aber. p. 173. Oblong-fusiform, thin, dull 

 white, with the spire tapering to a rather obtuse point, 

 and somewhat convex in outline, with numerous longi- 

 tudinal narrow ribs dividing on the body (whose breadth 

 is rather less than the length of the spire) into several 

 raised lines, and all reticulated with transverse raised 

 lines; whorls slightly subangulated above, the space 

 between the angle and the distinct suture convex and 

 sloping ; mouth oblong, narrow, deeply sinuated at the 

 suture, lip thin, canal very short. 0,17. ..0,50. Aber- 

 deen, fyc. 



GENUS. FUSUS. 



Fusiform or subfusiform, canaliculated at the base, 

 ventricose below or in the middle, without varices ; 

 spire elevated and elongated ; outer lip not notched; 

 pillar smooth ; operculum horny. 



* Whorh destitute of longitudinal ribs. 



