EXPLANATION OF PLATE II. 



CONOCEPIIAMTES SUI5CORONATUS '-i-'" 



Fig. 1. View of a glabella and fixed cheeks, sbowiug the general characters of the species. 

 Enlarged. 



Crepickitialhs (Loganellus) granulosus ~li 



Figs. 2-3. Vertical and profile views of a glabella and fixed cheeks, showing the form and 

 surface-markings. Enlarged. 



CONOCEPIIALITES (PteROCEPHALUS) LATICEPS 2-1 



Fig. 4. View of the central parts of the head, showing the peculiar form of glabella and 

 extended frontal limb. 

 r>. A movable cheek, with a portion of the under surface of the front of the head. 

 a. A part of a thoracic segment, associated with the other parts. 

 7. View of an imperfect pygidiuni, found in the same rock. 



CrEPICEPITAI.US (L0G.4.NEI.LUS) NITIPUS 212 



Fig. 8. View of the central portion of a head of the species, showing the character of these 

 parts, 

 9-10. Two pygidia, showing some variations iu the details. 



Crepickpiialus (Loganellus) quadrans 238 



Fig. 11. A glabella and fixed cheeks, enlarged. 



12. View of a cheek, enlarged to twice the natural size. 



13. View of a pygidium, enlarged to three times the natural size. 



Crepicepualus (Loganellus) Haguei 210 



Fig. 14. View of an entire individual, enlarged to twice the natural size, showing the form and 

 characters of the animal. 

 15. A single thoracic segment (third), enlarged to show more distinctly its structure. 



Crepicepualus (Loganellus) simulator 218 



Fig. 16. View of the central part of a head, showing the characters of the species. The lateral 

 limbs have been broken oi£ 



17. View of a movable cheek, enlarged to two diameters, showing the broad, flattened, 



marginal border. 



18. View of a much larger cheek, natural size (upper right-hand corner of plate). 



Crepicepualus (Loganellus) Anytus 210 



Fig. 19. View of the central parts of the head of a small individual, showing the angular 

 glabella and strong ocular ridges. 

 20 View of a movable cheek, natural size, showing the striated surface. 

 21. A iiygidiiini from the same block as the other sperimons. 



