G. K. TLffE ON" THE FAMILY DIASTOPOEID^. 361 



DlSCUSSIOS^. 



Prof. Du^"CAI^ expressed his sense of the value of the paper, which 

 was the work of a most icdnstrious student. His remark on the 

 distinction hetween the modern and ancient forms of Diastoporida? 

 showed that he had grasped the most important principle. The 

 specimens were common ; bnt stiU the distinctions were difficult to- 

 ascertain. 



