ARTHROPOD A — CRUSTACEA — TRILOBITES 295 



Fig. 127. — The trilobite, Paradoxides harlani Green ( X f), abundant in the marine 

 Braintree slates (Middle Cambrian) of eastern Massachusetts, e., eye lobe ; 

 Ja.s., facial suture; gl., glabella; gla.J., glabellar furrows; pg., pygidium ; pl.sp., 

 pleural spines. (Redrawn from Walcott.) 



