HARP A. 



upper part it is united to the outer lip, and at the base it 

 terminates in a point. The ridges, or costae, on the outside 

 of the shell are generally pointed at their superior extre- 

 mity, and then turn to the left to join themselves to the 

 upper part of the inner lip. 



The recent species of this Genus, which are not nu- 

 merous, are all inhabitants of the Indian ocean, and their 

 animal is unknown. A single fossil species occurs rarely 

 at Grignon, near Pra-is ; at Bordeaux, and near Valognes; 

 we have represented it ; its spire is more distinct, and the 

 interstices of the ridges are prettily reticulated. 



Fig. I Harpn mulHcosiala. 

 2 mutica. 



