136 CONTRIBUTIONS 



P. rugosa. Plate 4. Fig. 130. 



Description. Shell fusiform, turrited, transversely and 

 widely striate on the inferior part, furnished with one row 

 of folds and one of granulations ; substance of the shell 

 rather thin ; suture sulcate ; spire elevated, acute at apex ; 

 whorls twelve ; mouth narrow, one third the length of the 

 shell. 



Length .8, Breadth 5-20ths, of an inch. 



Observations. The folds and granulations of this species 

 give it a rougher appearance than the others described 

 here. The furrow along the suture is marked, being 

 formed by the two superior transverse large striae. On 

 the superior part of the whorl, there are in some speci 

 mens minute transverse striae. 



P. obliqua. Plate 4. Fig. 131. 



Description. Shell transversely and alternately striate 

 below, canaliculate above, furnished with a row of oblique 

 folds on the wider part of the whorl ; substance of the 

 shell rather thick ; whorl subcanaliculate above ; mouth 

 long and narrow. 



Length .... Breadth A, of an inch. 



Observations. A single whorl only, being the inferior 

 one, has come under my notice. It is perhaps the largest 

 species here described. The description is of course de 

 fective, for want of the superior whorls. I have no hesita- 



