PLATE VI. 



Carboniferous Trilobites. 



Figs. 1 a and h. — Griffithides glohiceps, Phillips, sp. a. Upper view; h, side view of 

 an entire specimen from the Carboniferous Limestone, Millicent. Magnified once and a 

 half natural size. Original specimen in the Museum of the Geological Survey of Ireland, 

 Dublin. (P. 29.) 



Pig. 2. — A nearly perfect head of Grijjithides acantkiceps, H. Woodw., from the 

 Carboniferous Limestone, Settle, Yorkshire. Enlarged one and a half times natural size. 

 Original specimen in the Woodwardian Museum, Cambridge. (P. 32.) 



Fig. 3. — An entire rolled-up example of G. glohiceps. J]nlarged twice natural size. 

 From the same locality, formation, and collection as Fig. 1. (P. 29.) 



Fig. 4. — Pygidium of same species, from same. (P. 29.) 



Fig. 5. — Hypostome. Enlarged four times natural size. From the Carboniferous 

 Limestone, Tyrone, Derryloran. Original in the Geological Survey Museum, Dublin. 

 (P. 29.) 



Fig. 6. — Pygidium from the Carboniferous Limestone, Bolland, Yorkshire. Magni- 

 fied twice natural size. Original specimen in the British Museum (Nat. Hist.). (P. 29.) 



Fig. 7. — Griffithides longiceps, Portlock. An entire specimen. Magnified twice 

 natural size. Carboniferous Limestone. Ireland. Original in the Museum of Practical 

 Geology, Jermyn Street. (P. 33.) 



Fig. 8. — OutUne restoration of same. Enlarged about four times. (P. 33.) 



Fig. 9. — Pygidium of G. longiceps. Carboniferous Limestone; Ireland. Original 

 specimen in the Museum of the Geological Survey of Ireland, Dublin. Magnified twice 

 natural size. (P. 33.) 



Fig. 10. — G. acanthicejjs. Detached head from the Carboniferous Limestone of 

 Settle, Yorkshire. Drawn natural size. Original in the Woodwardian Museum, Cam- 

 bridge. (P. 32.) 



Fig. 11. — G. acantliiceps. Detached head. Enlarged once and a half natural size. 

 From the Carboniferous Limestone. Original in the cabinet of the Rev. E. 0. de la Hey. 

 (P. 32.) 



Fig. 12. — G. obsoletus, Phil. Pygidium. Drawn natural size. From the Carbo- 

 niferous Limestone of Bolland, Yorkshire. Original specimen in the British Museum 

 (Nat. Hist.). (P. 35.) 



Fig. 13. — Grijfilhides plafgceps, Portlock (an imperfect glabella only). Enlarged 

 twice natural size. From the Carboniferous Limestone, Tyrone, Derryloran. Original 

 specimen in the Museum of the Geological Survey of Ireland, Dublin. (P. 34.) 



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