EXPLANATIOX OF PLATE XL 



(All figures after CL'irk.') 



Tre.matopvcus cruciferus (Morton), p. 289 



1-4. Dorsal, ventral, lateral and posterior \"!e\vs of a complete in- 

 dividual. 

 5- IwO\\er portion of the petaloid region of the right postero- 

 lateral ambulacrum. 



6. ^luch enlarged \ie\v tif se^'eral of the same anibulacral plates. 



7. Apical disk, enlarged. 



8-9. Two "\ae\vs of a tnliercle, from aho\"e and fr'im the side. 

 L/)ka'»fi'a'H liiDCsanJ: I'huh'cr Creek. 



C.-\T0Pvcrs oviFORMis Conrad p. 291 



10-13. Dorsal, ^-entral, lateral and posterior views of a complete 

 individual. 



14. Right postero-lateral ambulacrum, enlarged. 



15. Several ambulacral plates, highly magnified. 



« I'incentnwn linicsand : Titiihcr Creek. 



C.M'OPYC.us pusiLFUs Clark p. 292 



16-19. Dorsal, ventral, later.il ami posterior views of a complete 

 indi\ddual. 



JMerehantville elav-viarl. 



902 



