TO GEOLOGY. 137 



tion, however, from what remains, to consider it distinct ; 

 the folds, the striae and general form differing from any of 

 the species here described. 



P. Childreni.* Plate 4. Fig. 132. 



Description . Shell fusiform, turrited, transversely striate, 

 granulate on the larger part of the whorl ; substance of 

 the shell rather thick ; spire elevated, obtuse at apex ; 

 whorls about nine, subcanaliculate above ; mouth long 

 and narrow, one third the length of the shell. 

 Length .9, Breadth .3, of an inch. 



Observations. This is a beautiful species, distinct by its 

 granulations, the row of which is disposed to be double. 

 About the middle of the whorl the striae are large. On 

 the superior part there are two or three minute ones. 



P. Lesueurii.-\ Plate 4. Fig. 133. 



Description. Shell fusiform, turrited, covered with 

 closely set transverse striae, which are cut by indistinct 

 longitudinal ones ; substance of the shell rather thick ; 

 spire elevated, acute at apex ; whorls about nine, subcan- 

 aliculate above ; mouth long and narrow, about two fifths 

 the length of the shell. 



Length 1.1, Breadth .4, of an inch. 



* Named after the secretary of the Royal Society, eminent for his 

 acquirements in science, 

 t Named after the naturalist M. Lesueur, the companion of Peron. 



S 



