70 



T. H. Clark — A New Agelacrinitid. 



Description. 



Carney ella valcourensis sp. nov. 



The type and only known specimen is incomplete, but 

 the original theca was probably slightly less than three- 

 qnarters of an inch in diameter. The peripheral ring is 

 for the most part missing, but where it is preserved it is 

 narrow and composed of an inner ring of large plates 

 and an outer circlet of small ones. All five rays can be 

 seen, but only one is complete. Adopting the conven- 

 tional system of numbering the rays, ray I is seen to be 

 curved in a contra-solar direction, while ray V is solar, 

 the two enclosing the anus. Rays II and IV are both 

 incomplete, the latter being continued to some extent 

 upon the aboral surface by being doubled under. Ray 

 III is missing on the upper surface altogether, but part 

 of it was preserved upon the under side when the indi- 

 vidual was deformed. The specimen is not sufficiently 

 well preserved to allow an examination of the flooring 

 plates (sensu Foerste), nor can any accessory covering 



Fig. 1. — Sketches of the two sides of the type specimen, Carney ella val- 

 courensis Clark. X 4. 



plates be observed. The anal pyramid is composed of 

 numerous small mosaic plates with an eccentric circular 

 anal opening. The supra-oral plates are quite well pre- 

 served, three in number, larger than the lateral covering 

 plates, and different in form from them. The interradii 

 are covered, where shown, by large plates. 



The specimen is free, but with the posterior part of the 

 oral surface doubled under so as to appear to be on the 

 aboral surface. It was collected from the Middle Chazy 

 limestone, or more exactly, from the top of Raymond's 

 Zone A 20 . 4 



* Ann. Carnegie Mus., Vol. 3, No. 4, 1906, p. 514. 



