Blastoidocrinus carchariaedens Billings (sp.) 

 Page 97 



Figures a-o are of the under or inner surfaces of what the author has called 

 apical or anal pieces. They show the gradual development of a depression 

 (due to downward growth of the piece) which led Mr E. Billings to describe 

 them as possessing a "central perforation." The oldest member of the 

 series seems to clearly show the impression of five subtegmenal? plates 

 of the peristome, the one in the lower interradius of the figure being dis- 

 placed. Other figures, particularly 1, show traces of the displaced plate 

 and of the other plates. 



Figures p, q and x are of outer surfaces. A four rayed piece is shown at g and 

 a six rayed piece at x. 



The remaining figures are of stem joints and of roots that may belong to this 

 species. 



The specimens figured are now in the New York State Museum. 



