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STRATIGRAPHICAL DISTRIBUTION OF 



FAMILIES, 

 GENERA, AND SPECIES. 



Fain. Saleniad^e. 

 Acrosalenia minuta, Buckman 

 crinifera, Quenstedt 

 Lycetti, Wright 

 pustulata, Forbes . 

 Wiltonii, Wright . 

 Loweana, Wright . 

 spinosa, Agassis 

 hemicidaroides, Wright . 

 decorata, Haine 



Fam. EchinoconidjE. 

 Holectypus depressus, Leske . 



hemisphaericus, Desor 



oblongus, Wright . 

 Pygaster semisulcatus, Phillips 



conoideus, Wright . 



macrostomus, Wright . 



Morriaii, Wright . 



umbrella, Lamarck 



Fam. Echinobrissid^e. 

 Echinobrissus clunicularis, Llhwyd 

 Woodwardii, Wright 

 orbicularis, Phillips 

 quadratus, Wright . 

 Griesbachii, Wright 



LOWER DIVISION. 



Lias. 



Lower 

 Lias. 



Middle 

 Lias. 



Upper 

 Lias. 



Murchi- 

 sonse zone 



Inferior Oolite. 



Humphrie- 

 siauus 

 zone. 



Parkinsoni 

 zone. 



Great Oolite. 



Tuller's 

 Earth. 



Stonesfield 

 Slate. 



Great 

 Oolite. 



Bradford 

 Clay. 



