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STRATI GRAPHICAL DISTRIBUTION OF 



FAMILIES, 



LOWER DIVISION. 



GENERA, AND SPECIES. 



• 



Lias. 



Inferior Oolite. 





Great Oolite. 



Lower 

 Lias. 



Middle 

 Lias. 



Upper 

 Lias. 



Murclii- 

 sona: zone. 



llumphrie- 

 sianus 

 zone. 



Pai'kinsoni 

 zone. 



Fuller's 

 Earth. 



Stonesfield 

 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, Agassiz . 



Mulleri, Wright . 



subulatus, Young and Bird . 









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Fam. COLLYRITILVE. 

 Collyrites ringens, Agassiz 



ovalis, Leske .... 



bicordata, Leske 

 Hyboclypus agariciformis, Forbes . 



caudatus, Wright . 



gibberulus, Agassiz 



ovalis, Wright 









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Fam. Echinanthid.*:. 

 Pygurus Michelini, Cotteau . 



WCH l<lLiUIl<lllo, JL fllLLlJJo • • 



Blumenbachii, Koch Bunker 

 Phillipsii, Wright . 

 Hausraanni, Koch Bunker . 

 coatatus, Wright . 













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