JURASSIC AND TRIASSIC BRACHIOPODA. 



231 



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Waldheimia cornuta, Sow 





















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„ numismalis, Lamk 

















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subnumismalis, Davids 

















„ Marine, d'Orb 

























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,, resupinata, Sow 























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...,x 



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Rhynchonella tetraedra, Sow 





















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„ rimosa, Buck 

















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„ amalthei, W. S 





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„ acuta, Sow 























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„ pvemsea, Morris 



























„ variabilis, Schloth 













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,, Glevensis, Smithe 





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„ oxynoti, Querist 









Spiriferina Muensteri, Davids 













„ Walcotti, Sow 













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„ rostrata, Schloth 

















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,, verrucosa, Buch 

















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„ Ilminsteriensis, Davids 

















Leptaena liasina, Bouchard. 



























„ Moorei, Davids 





















































If we view the Lias as a whole, it will be found that not more than from 70 to 75, if 

 so many, good species have, up to the present time, been discovered in that formation 

 in Great Britain. 



The Oolites. 



We begin the Oolitic Series by those so termed "Passage-beds," or "Midford 

 Sands," classed by some geologists as part of the Upper Lias, and by others as the base 

 of the Oolite Series. 



1. Passage-beds. — 6 species and 2 varieties have been recorded; but I would invite a 

 further search and a more complete study of the species that occur in this important 

 deposit. 



2. Inferior Oolite. — 67 species and a few named varieties ; but this list has been 

 somewhat increased by several minute forms which in some cases may turn out to be the fry 

 or young of some of the others, so that we must estimate at under 60 the number of good 

 species discovered in this, the richest of the formations composing the Oolitic Series. 



3. Fullers' Earth-rock. — Some 6 or 7 species. Of these at least six occur likewise 

 in the Inferior Oolite, showing the close connection between the two formations. 



