MARL-SLATE AND LOWER MAGNESIAS LIMESTONE. 191 



(more than an inch, in width) imperfect specimen appears also 

 to belong to this species. 



9. Strophalosia lamellosa, Gel. 



Very common ; gregarious. Varying from less than -J-th to ^ 

 an inch in width; the great majority young individuals, and 

 only about an ^th wide. All with a strongly impressed, semi- 

 lunar scar of attachment on ventral valve, which in the dorsal 

 valve of course appears as a similarly shaped elevation. In young 

 examples the semilunar scar forms fully half the shell. The 

 radiating, raised striae are well seen, and most of the specimens 

 are strongly marked concentrically with lines of growth. 



10. Terebratt/la sacctjla (elongata), Mart. 

 Rare. 



11. PhFLLOPORA Ehrenbergi, Get. 

 Rare. 



12. Fenestella retieormis, Sch. 



Not uncommon as fragmentary impressions. 



12. ICHTTHORACHIS ANCEPS, Sell. 



Common as impressions. Variety with short pinnules. 



13. Stenopora column aris, Sch., with var. Buchiana, 'king. 

 Not uncommon ; the latter attached to shells. 



14. Klrkbya Permian a, Jones. 



15. Cythere necieormis, Jones. 



16. Bairdia curta (plebeia), McCoy. 



Specimens of Entomostraca are not uncommon in some of the 

 slabs of limestone, and there are probably more species than the 

 three named above, though these are all I have been able to 

 determine. 



] 7. Dentalina Permiana, Jones, var, Kingi. 

 Pare. 



