PALiEOZOIC MOLLUSCA. 247 



with four or five much finer intermediate strise. Diameter 

 1 inch 5 lines, proportional diameter of last whorl j-^-^, height 



32 

 Too* 



This species is more regularly involute than the E. Bucklandi 

 (Portk.), and has the principal keel on the upper side nearer to 

 the beak. There are three or four of the larger strise in the 

 space of 1 line about the middle of the under side of last whorl. 



Not uncommon in the schistose Chazey limestone of Knock- 

 dollian quarry, three miles from Ballintrae ; also in the calcareous 

 schists of Mullock quarry, Dalquorhan, near Girvan, Ayrshire. 



{Col. University of Cambridge.) 



