80 
EHxPLANATION OF PLATE II. 
ENCRINURUS SEX-COSTATUS, Salter. 
Vig. 1, A rolled up specimen; from Rhiwlas. 
Fig, 2. A view showing the 11 thoracic segments. 
Fig. 3, Anterior view of the head and tail, showing the raised ridge of 
the anterior branches of the facial suture. 
Kig. 4. Side view. 
ig. 5, Head cheeks and glabella, showing pitted surface. 
Vig. 6. Magnified view of glabella, showing tuberculated and granulated 
surface of glabella, with 3 lateral glabella furrows. 
Fig, /, A thoracic segment enlarged: at a, the ftilcoral point; b, the 
facetted, and c, the blunt, indented tip of the segment. 
Fig. 8. Side view of the pleurae in a coiled state; at a, one of the facetted 
surfaces is seen. 
Hig. 9, The pygidium, 
ig. 10. Part of the same magnified, to show the scabrous surface, 
ig. 11. Variety of the pygidium, with 7 pleurae; also fig. 12. 
Photographic copies of Salter’s plate 4, figs. 1-12. 
ig. 13. KNCRINURUS (CROMUS) BrkAUMONT’I, Barr. ‘The head. 
I‘ig. 13-a. The under side of the head. 
Fig. 14. Side view of the head. 
Fig, 15, Anterior view, showing course of facial sutures, 
Fig. 16. ENCRINURUS (CROMUS) TRANSIENS, Barr. Glabella and _ fixed 
cheeks, 
Fig.17. Side view. 
Hig, 18. The hypostoma. 
Fig. 19. Front view of the hypostoma. 
lig. 20. Encrinurus (Cromus) Bonmmicus, Barr. Front and side view of 
the hy postoma. 
Big. 2h, > [ie same, 
Fig. 22. KE NCRINURUS (CROMUS) INTERCOSTATUS, Barr. The hypostoma. 
Vig. 23. KNCRINURUS PUNCTATUS. Side view of head. 
lig. 24. Side view of hypostoma. 
