.v 



EXPLANATION OF PLATE XII. 



CATOPYGUS WILUAMSI 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. 



CASSIDULUS 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. 



Vinccntown limcsand. 



904 



