424 



STRATIGRAPHICAL DISTRIBUTION OF 





LOWER DIVISION. 



FAMILIES, 

 GENERA, AND SPECIES. 





Lias. 



Inferior Oolite. 



Great Oolite. 





Lower 

 Lias. 



Middle 

 Lias. 



Ppper 

 Lias. 



Murchi- •^"■"P^,''- 



Parkinsoni 

 zone. 



Juller's 

 Eai-tli. 



Stonesfield 

 Slate. 



Great 

 OoUte. 



Bradford 

 Clay. 





Fam. Saieniad^. 

























Acrosalenia minuta, Buckman 



* 























crinifera, Quenstedt 







* 



















Lycetti, Wright 



... 







* 



# 



* 





• 









pustulata, Forbes . 



















* 







Wiltonii, Wright . 



... 



... 













... 









Loweana, Wright . 



... 



... 





















spinosa, Agassiz 





... 









* 





•'- 



* 







hemicidaroides, Wright . 



















* 







decorata, Haine 

























Fam. EcHiNocoNiD^. 

























Holectypus depressus, Leske . 













* 





* 



* 







hemisphsericus, Desor 



... 











# 













oblongus, Wright . 

















... 









Pygaster semisulcatus, Phillips 









* 











* 







conoideus, Wright . 









* 

















macrostomus, Wright . 





... 

















... 





Morrisii, Wright 



... 













... 





... 







umbrella, Lamarck 



... 



... 



... 



... 











... 







Fam. BcHiNOBRissiD^. 

























Echinobrissus clunicularis, Llhwyd 













* 





* 



* 







Woodwardii, Wright 



















* 







orbicularis, Phillips 









... 





... 







... 







quadratus, Wright . 

























Griesbachii, Wright 

























