TRILOBITA—OPISTHOPARIA. 



267 



Fig. 1559' ^> ^t Paradoxides harlani : a, young cranidium, X /^» ^'^^ ^j doublure 

 and hypostoma of adult, X /^ > c, P. lamellatus, an imperfect cranidium, yC, % ', dy 

 P. eteminicus, cranidium, y^ % \ e, pygidium of same, X %- (^^^ ^^^^^ Walcott. ) 



