280 



APPENDIX. 



lately convex, the dorsal one gently concave, and about eight slanting spines rise from the 

 cardinal edge. Surface markings unknown. Length 6, breadth 8 lines. In PI. LV, 

 fig. 16, will be found a correct representation of these casts, which Mr. Kirkby found to 

 be associated with a large variety of Sjj. Urii, and with some Permian species belonging 

 to other classes. Mr. Kirkby assures me that the bed containing these fossils is truly 

 Permian. The Rothleigende, Marlstone, and about fifty feet of the Lower Limestone, are 

 all to be seen in the same quarry below it. 



INDEX TO THE APPENDIX. 



Rhynchonella Wettonensis, Dav. 

 Puodtjctus Carringtoniana, Dav. 



,, (or Chonetes) comoides, Sow. 



., Llangollensis, Dav. 



Chonetes eoncentrica, De Kon. ? 



„ 1 (Permian) 



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