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, z 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 strie. On 
the superior part of the whorl, there are in some speci- 
mens minute transverse strie. 
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 .4, 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- 
