REPORT OF THE STATE PALEONTOLOGIST 1901 



609 



fairly demonstrated their equivalence to sediments elsewhere 

 extending from the middle Trenton upward to the top of the 

 Lorraine shales. From these Moffat beds and in association 

 with some of the graptolites, Prof. T. R. Jones and Dr H. Wood- 

 ward have described a number of circular shields of chitinous 

 substance, concentric markings and triangular cleft, as crusta- 

 ceans under the name of Discinocaris. The type species of this 

 group of putative phyllopods is D. b r o w n i a n a ; and among 

 them is the large shield to which we have referred, Discino- 

 caris gigantea. Examination of the figure with restored 

 outline given by these authors, which we reproduce here, shows 



Discinocaris gigantea after Jones and Woodward 



evidence of the convergent internal ridges showing through or 

 impressed on the surface ornament and corresponding to these 

 well marked muscular characters in Eunoa. This specimen 

 is apparently the most nearly entire of any recorded; but the 

 authors note that fragments of these bodies indicate a diam- 

 eter of fully 7 inches. That Eunoa is a brachiopod of which 

 we have both valves is beyond contest; and that Discino- 

 caris gigantea, occurring in homotaxial rocks of similar 

 character formed under like bathymetric conditions and with 



