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STRATI GRAPHICAL DISTRIBUTION OF 



FAMILIES, 

 GENERA, AND SPECIES. 



Hemicidaris Bravenderi, Wright 

 Wrigbtii, Desor 

 Icaunensis, Cotteau 

 intermedia, Fleming 

 Davidsonii, Wright 

 Purbeckensis, Forbes 



Fam. DiademaDjE. 

 Pseudodiadema lobata, Wright 

 Mooreii, Wright 

 Wickense, Wright 

 depressura, Jgassiz 

 Parkinsoni, Desor . 

 pentagonum, M'Coy 

 hornostigma, Agassiz 

 Bailyi, Wright 

 vagans, Phillips 

 Bakerise, Woodward 

 versipora, Phillips . 

 hemispbsericum, Agassi 

 radiatum, Wright . 

 mamillanum, Roemer 

 Hemipediua Becbei, Broderip 

 Bowerbankii, Wright 

 Toniesii, Wright . 

 Jardinii, Wright . 

 Etberidgii, Wright 



LOWER DIVISION. 



Lias. 



Inferior Oolite. 



Lower Midiile 

 Lias. Lias. 



Upper Murchi- 

 Lias. sou£c zone. 



Humphrie 

 siaDus 



Parkinsoni 

 zone. 



Great Oolite. 



Fuller's 

 Earth. 



Stonesfield 

 Slate. 



Great 

 Oolite. 



Bradford 

 Clay. 



