PLA'I'E IV. 



Carbonifkrous Tkii,obitks. 



Fig. 1. — Phillipsia Eichwaldi, var. mucronata, M'Coy. An almost complete specimen showing the 

 mucronate tail, and the long cheek-spines so characteristic of this species. The right side is however 

 injured. From the black Carboniferous Limestone of Wilkiestone, Fife. Drawn natural size. Original 

 specimen in the cabinet of Dr. R. H. Traquair, F.R.S., of Edinburgh. (P. 23.) 



Fig. 2. — PhiUipsia Eichwaldi, Fischer, sp. A nearly perfect specimen, agreeing closely with Fig. 1 

 in all particulars of structure save that the mucro of the pygidium is wanting. From the Lower Limestone 

 series, Newfield Quarry, near High Blantyre, Lanarkshire. Magnified twice the natural size. Original 

 specimen in Mr. J. Young's collection, Glasgow. (P. 22.) 



Fig. 3. — Ph. Eichwaldi, var. mucronata, M'Coy. A detached head magnified twice the natural size, 

 from the same horizon and locality as Fig. I. From Dr. Traquair's cabinet. (P. 23.) 



Fig. 4. — Ph. Eichwaldi, Tischer, sp. A detached hypostome, believed to belong to this species. 

 Enlarged three times the natural size. From the Upper Limestone series, Dairy, Ayrshire. Original 

 specimen in Mr. John Young's collection. (P. 22.) 



Fig. 5a. — A nearly entire rolled-up specimen, the cheek-spines and extremity of the pygidium are 

 wanting ; the facets of one eye are beautifully preserved. (P. 22 ) 



Fig 56. — Thoracico-abdominal segments of same fossil. The original specimen in Mr. J. Thomson's 

 collection, Glasgow. 



Fig. 6. — Detached glabella, showing pores (p) on each side of head in front of the eyes. From 

 same locality and collection as Fig. 4. Enlarged twice natural size. (P. 22.) 



Fig. 7. — Detached hypostome. From the Upper (Carboniferous) Limestone Series, Dairy, Ayrshire. 

 Magnified four times natural size. Original specimen in the collection of Mr. R. Craig, Langside, Beith, 

 Ayrshire. (P. 22.) 



Fig. 8. — Underside of head, exhibiting the pores (jo) upon the underside of the margin of the 

 glabella, at its union with the cheeks on each side, in front of the compound eyes. Lower (Car- 

 boniferous) Limestone Series, ScuUiongour near Lennoxtown, Campsie, Sterlingshire. Magnified twice 

 natural size. Original specimen in Mr. John Young's collection, Glasgow. (P. 22.) 



Fig. 9. — Part of thorax and perfect rounded pygidium. From the same locality and formation as 

 Fig. 7- Magnified twice natural size. Original specimen in Mr. J. Young's collection. P. 22. 



Fig. 10. — Head, closely associated with a rounded pygidium, like Figs. 9 and 13. Showing pores 

 {p.) at sides of glabella as in Figs. 6 and 8. Enlarged twice natural size. From the same locality and 

 formation as Fig. 9. Original specimen in Mr. Young's collection. (P. 22.) 



Fig. 11. — Free cheek showing the compound eye and the long cheek-spine, magnified twice natural 

 size. From Shale below Fourth Limestone, Dairy. Original specimen in Mr. J. Smith's collection, Stobs, 

 Kilwinning. (P. 22.) 



Fig. 12. — Ph. Eichwaldi, var. mucronata, M'Coy. Mucronated pygidium (twice natural size) from 

 Sliale below Upper Limestone, Garple Water, Muirkirk. Mr. J. Smith's collection. (P. 23.) 



Fig. 13. — Ph. Eichivaldi, Fischer, sp. Rounded pygidium like Fig. 9, and from the same locality 

 and collection as Figs. 7 and 9. Magnified twice natural size. (P. 22.) 



Fig. 14a, h, and c. A nearly entire and rolled-up specimen, the cheek-spines are broken off, but were 

 evidently long as in Figs. 1 and 2. The tail is non-mucronate, as in Fig. 2. Both specimens are from 

 the same locality and collection, a. View of head seen from above ; b, profile of same ; c, the pygidium of 

 same specimen. Magnified twice natural size. (P. 22.) 



Fig. 15. — Ph. Eichwaldi, var. mucronata, M'Coy. Outline restoration ; (p) position of pores on 

 glabella. (P. 23.) 



