LIST OF PLATES. 



I. Phillipsia Derbiensis. 

 IT. Phillipsia Colei. 



III. Phillipsia gemmulifera and Phillipsia truncatula. 



IV. Phillipsia Eichwaldi and Ph. Eichwaldi var. mucronata. 

 V. Griffithides seminiferus. 



VI. Griffithides globiceps, acanthiceps, longiceps, obsoletus, and platyceps. 

 VII. Phillipsia quadrilimba, laticaudata, Griffithides acanthiceps, longispinus, brevispinus, moriceps, 

 and calcaratus. 

 VIII. Brachymetopus ouralicus, Maccoyi, discors, hibernicus, and Griffithides semini/erus. 



IX. Griffithides acanthiceps, globiceps, longispinus, glaber, Carringtonensis, and Phillipsia scabra 

 and carinata. Serolis paradoxa and Sphocroma gigas (recent). 

 X. Phillipsia Leei, minor, Cliffiordi, and articulosa. 



LIST OF WOODCUTS. 



Fig. 1. Pygidium of Proetus? levis, H. Woodw. Carboniferous Limestone, Co. Dublin 



Fig. 2. Phillipsia cequalis, H. v. Meyer. Culm, Aprath 



Fig. 3. Phillipsia, sp. Culm, Marburg 



Fig. 4. Pygidium of Griffithides globiceps, De Kon. . 



Fig. 5. ,, Phillipsia Derbyensis, Martin . 



Fig. 6. „ Dalmanites ? Cuyahogce, Claypole 



Fig. 7. „ Phillipsia Lodiensis, Meek 



Fig. 8. „ Brachymetopus discors, M'Coy . 



PAGE 



57 

 67 

 07 

 79 

 79 

 79 

 79 

 79 



