156 ANNALS NEW YORK ACADEMY OF' SCIENCES 



If we except Griffithides sangamonensis, which I believe to be a PhiUip- 

 sia, only two species of Griffithides are known in our American Pennsyl- 

 vania^ G. ornatus and G. scitulus, and of these only G. ornatus appears 

 to be marked with nodes like the present form. In many respects G. par- 

 vulus is very similar to G. ornatus, but aside from being very much 

 smaller, it presents important and striking differences in the configura- 

 tion of the basal portion of the glabella. 



Horizon and locality: "Wewoka formation; Wewoka quadrangle, Okla. 



