PLATE IX 

 TRIARTHRUS (Pages 213-219) 



FiGUHE 1. — Triartlirux Becki Green ; dorsal view; showing character 

 anil extent of antennnles and limbs beyond the carapace. X 2^- 



Figure 2. — Triarthrus Becki Green; ventral view; showing entire 

 s(n-ies of appendages, together witli hypostonia, metastoma, and anal 

 opening, x 2^. 



Utica Slate, Ordovician, near Rome, New York. 



