PLATE III. 



Carboniferous Trilobites. 



Figs. 1 — S. — PhUlipsia (/emmiiUfera, Phillips, sp., 1836. (P. 17.) 



Fig. 1. — A very perfect and entire specimen in hard crystalline Carboniferous Lime- 

 stone, Kildare, Ireland. Magnified three times natural size. Original specimen in the 

 Museum of Practical Geology, Jermyn Street. 



Fig. 2. — A perfect detached head (one of the eyes showing the facetted surface very 

 clearly), preserved in dark crystalline Carboniferous Limestone, St. Doolagh, Dublin. 

 Magnified twice natural size. Original specimen in the Museum of the Geological 

 Survey of L'eland, Dublin. 



Fig. 3. — An entire thorax and abdomen, but without a head, from the Carboniferous 

 Limestone, Clitheroe, Lancashire. Magnified twice natural size. Original specimen in 

 the collection of John Aitken, Esq., of Sandfield, Urmston, Manchester. 



Fig. 4. — A very perfect detached pygidium, preserved in white crystalline Carbo- 

 niferous Limestone ; said to be from Derbyshire (more probably from Settle, Lancashire). 

 Magnified twice natural size. Original specimen in the British Musuera (Nat. Hist.), 

 Cromwell Road. 



Fig. 5. — Another well-preserved detached pygidium, in crystalline Carboniferous 

 Limestone from Bolland, Yorkshire. Magnified twice natural size. Original specimen 

 in the British Museum (Nat. Hist), Cromwell Road. 



Fig. 6. — Phillipsia c/emmulifera, Phil., sp. Restored outline. 



Fig. 7 a and b. — One of the thoracic somites, drawn in outline. 



Fig. 8. — One of the eyes enlarged six times to show the facets. From a specimen 

 in Mr. John Rofe's collection, novv in the British Museum (Nat. Hist.), Cromwell 

 Road. 



Figs. Q—U.—PhiUipsia inmcaiula, Phillips, sp., 1836. (P. 21.) 



Fig. 9. — A detached head, from black Carboniferous Limestone, with Feneslella 

 from Hook Point, Co. Wexford, Ireland. Drawn of natural size. Original specimen in 

 the Museum of the Geological Survey of L'eland, Dubhn. 



Fig. 10. — A second detached head, from the same formation and locality. Natural 

 size. 



Figs. 11 and 12. — Two detached pygidia, from the same locality. Original speci- 

 mens of figs. 10, 11, and 12, in the Woodwardian Museum, Cambridge. 



Fig. 13. — Phillipsia Irnvcatula, Phil., sp. Restored outline of head. 



Fig. 14. — „ ,, Restored outline of pygidium. 



