EXPLANATION OF PLATE XII. 



CATOPYGUS WIUJAMSI Clark n. sp., p. 292 



(Illustrations contributed by Dr. W. B. Clark.) 

 1-4. Ventral, dorsal, posterior and lateral views of a complete in- 

 dividual. 



Navesink marl; bluff east of Atlantic Highlands. 



CASSIDUUJS AEQUOREUS Morton, p. 293 



(All figures after Clark.) 



5-8. Posterior, lateral, ventral and dorsal views of the type speci- 

 men from Alabama. 

 9. Anterior ambulacrum enlarged. 



10. Several ambulacral plates from the petaloid region, much 



enlarged. 



11. Several ambulacral plates from the oral region. 



12. Apical disk, much enlarged. 



limcsand. 



904 



