200 Shinier — Specimen of Strenuella strenua (Billings). 



obtusely angular front and the rather broad depressed area 

 anterior to the glabella. 



B 



A 



A. Strenuella strenua (Billings), a nearly complete specimen. x 2. 



B. Transverse section through the 5th pleural segment, to show the con- 

 vexity of the axis and pleura, the latter being angular. x 2. 



C. Photograph of the specimen, x 2. 



Referring to the original generic description of Strenuella 

 by Matthew* it is noted that it departs from Agraulos and 

 resembles Ellipsocephalus in the marked elevation of the parts 

 * Trans. Roy. Soc. Canada, vol. iv, sec. 4, p. 154. 



