EXPLANATION OF PLATE X. 



Figs. 1 — 4. — PMllipsia Leei, H. "Woodw., sp. nov. Lower (Carboniferous) 

 Culm-shales, Waddon-Barton, near Chudleigh, Devonshire. (P. 66.) 



Fig. 1. — Head- shield with part of the pygidium seen. The thoracic segments 

 appear to underlie the head, and to be squeezed against the carapace beneath. 

 Specimen enlarged three times. 



Fig. 2. — Head-shield with five thoracic segments still united ; also a detached 

 pygidium. Enlarged three times. 



Fig. 3. — A third head-shield with the left eye fairly preserved, showing also 

 the facial sutures and the oblique furrows on the glabella. Enlarged three times. 



Fig. 4. — Another head showing trace of the eye, and the facial suture and 

 basal lobe of the glabella ; also part of thoracic segments. Enlarged four times. 



Figs. 5, 6 a, b — 8, 8 a. — Phillip sia minor, H. Woodw., sp. nov. Formation and 

 locality the same as that of the preceding species. (P. 68.) 



Fig. 5. — A pygidium seen in intaglio. Enlarged four times. 



Fig. 6 a and b only. — a. Head-shield ; and b, pygidium of same. Enlarged 

 three times natural size. 



Fig. 7 a. — A nearly entire example, seen in intaglio, enlarged eight times 

 natural size, with one detached free-cheek (c) and hypostome (h). 



Fig. 8 a only. — A small detached head. Enlarged three times natural size. 



Fig. 8 b, and figs. 9 — 12. — PMllipsia Cliffordi, H. Woodw., sp. nov. Formation 

 and locality the same as that of the preceding species. (P. 69.) 



Fig. 8 b only. — Pygidium. Enlarged three times. 



Figs. 9 and 10. — Pygidia. do. 



Fig. 11. — Portion of a head-shield showing the right side of the glabella with 

 the free-cheek attached, and a detached pygidium. Enlarged four times. 



Fig. 12. — A detached pygidium. Enlarged eight times. 



Figs. 6 c, d (only) and Fig. 13. — PMllipsia articulosa, H. Woodw., sp. nov. 

 Formation and locality the same as that of the preceding species. (P. 70.) 



Fig. 6. — Two pygidia (c) seen from beneath, (d) seen from above. Enlarged 

 three times natural size. 



Fig. 13. — Detached pygidium. Enlarged four times. 



