U. S. NATIONAL MUSEUM 



BULLETIN 138 PL. 9 



1-4. PILUMNOPLAX CARMANAHENSIS. iPAGE 38.) 5, 6. PLAGIOLOPHUS WEAVERI. 



(Page 35.1 7. Branchioplax washingtoniana. iPAGE42i 



For explanation of plate see page 142 



