PLATE VII 



TRIARTIIRUS BECKI Gkeen (Pages 206-209) 



Figure 1. — Ventral side of a large specimen ; showing, at each side 

 of the hypostoma, the antenniiles with their single flagellum and strong 

 basal joint ; also the biramous cephalic appendages "with large gnatho- 

 bases ; the biramous thoracic limbs with gnathobases extending obliquely 

 backward in the axis of the trilobite; and the hypostoma, metastoma, 

 and anus, in the median line. X i. Utioa Slate, Ordovician, near Rome, 

 New York. 



