430 



STRATIGRAPHICAL DISTRIBUTION OF 









LOWER DIVISION. 



FAMILIES, 

 GENERA, AND SPECIES. 







. 



Lias. 



Inferior Oolite. 



Great Oolite. 





Lower 



Lias. 



Midule 

 Lias. 



Upper 

 Lias. s 



Murchi- 

 onee zone. 



Sumphrie- 

 sianus 

 zone. 



Parkinsoni 

 zone. 



Fuller's 

 Earth. 



Stonesfield 

 Slate. 



Great 

 Oolite. 



Bradford 

 Clay. 





Hemicidaris Bravenderi, Wright 



















* 







Wrightii, Besor 





















* 





Icaunensis, Cotteau 

















... 



^. 







intermedia, Fleming 

























Davids onii; Wright 

























Purbeckensis, Forbes 











■•• 















Fam. DiADEMADiE. 

























Pseudodiadema lobata, Wright 



* 























Mooreii, Wright . 







* 



















Wickense, Wright 







* 



















depressum, Agassis 









* 



* 









* 







Parkiasoni, Besor . 

















* 









pentagonum, M'Coy 



















;i: 







homostigma, Agassiz 





















'^ 





Bailyi, Wright 

























vagans, Phillips 



















-'v 







Bakerise, Woodward 

























versipora, Phillips . 

























hemisphsericum, Agassis 

























radiatum, Wright . 





... 





















mamillanum, Roemer 





















... 





Hemipedina Becliei, Broderip 



* 























Bowerbankii, Wright 



t- 



I 





















Tomesii, Wright . 



* 























Jardinii, Wright . 





* 





















Etheridgii, Wright 







* 



















