ARTHROPODA — 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; 

 fa.s., facial suture; gl., glabella; gla.f., glabellar furrows; pg., pygidium ; pl.sp., 

 pleural spines. (Redrawn from Walcott.) 



