in being entirely destitute of armature, either of spines or 

 tubercles, upon the angulated shoulder of the volutions, and 

 in being marked by coloured lines. In this last character 

 they approach F. perversus, Linn., but they will not be 

 mistaken for that species. As the shell ad\^nces in growth, 

 the acute edge of the depressed top of the whorls becomes 

 obtuse, and in the old shell it is nearly obsolete ; in which 

 state the almost regular curvature of the whorl is very like 

 that of Pyrula. 



Seba's figures above quoted, are probably intended for 

 this species ; they certainly represent it very well as it ap- 

 pears in the young state. 



Lamarck was unacquainted with the native country of 

 his spirattty the description of which he published in Au- 

 gust, 1 822, which gives the priority to pyruloides^ as this 

 was published in July of the same year, twelve months af- 

 ter it had been read to the academy. It inhabits our south- 

 em coast and I never found it so far north as New- Jersey . 



REFERENCE TO THE PLATE. 



The plate represents the back and front of the shell. 

 PLATE XIX. 



