426 



STRATIGRAPHICAL DISTRIBUTION OF 





LOWER DIVISION. 



FAMILIES, 

 GENERA, AND SPECIES. 





Lias. 



Inferior Oolite. 



Great Oolite. 





Lower 

 Lias. 



Middle 

 Lias. 



Upper 

 Lias. 



r 



Murchi- 

 sonae zone. 



Humphrie- 

 sianus 

 zone. 



Parkinsoni 

 zone. 



Fuller's 

 Earth. 



Stonesfieia 

 Slate. 



Great 

 Oolite. 



Bradford 

 Clay. 





Echinobrissus dimidiatus, Phillips . 

























! scutatus, Lamarck . 

















... 









Brodiei, Wright . 

























Clypeus Plotii, Klein . ■. 













* 



* 



* 



* 







Agassizii, Wright . 













* 













altus, M'Coy .... 













* 













Michelini, Wright . 









* 



* 















Hugii, Agassiz 













* 













rimosus, Agassis . 













* 













Miilleri, Wright 



















* 







subulatus, Young and Bird . 

























Fam. CoLLYRITIDiE, 

























CoUyrites ringens, Agassis 













* 













ovalis, Les/ce ... 













* 













bicordata, Leske 























■ 



Hyboclypus agariciformis, Forbes . 









* 











* 







caudatus, Wright . 













* 













gibberulus, Agassis 













* 



... 











ovalis, Wright 













* 













Fam. EcHINANTHIDiE. 

























Pygurus Michelini, Cotteau . 













* 







* 



* 





pentagonalis, Phillips . 

























Blumenbachii, Koch ^ Bunker 















... 











Phillipsii, Wright . 

























Hausmanni, Koch ^ Bunker . 

























costatus, Wright . 

























