PLATE XVIII. 



Fig. 



1. Impression of the dorsal surface of the left pectoral appendage of Asterolepis 



maxima, with a portion of the anterior ventro-lateral plate. The point of 

 the lower arm is gone. 



2. Natural mould of the internal cavity of the arm removed from the same 



specimen, and seen from the dorsal surface, showing very distinctly the 

 impressions of the deep surfaces of the constituent plates, and of the sutures 

 between them ; unfortunately wanting the point, and fractured across below 

 the joint. 



3. The same, seen from the ventral surface. 



4. Ventral surface of the proximal division of the limb of the right side, broken 



off immediately above the elbow-joint, and retaining most of the actual 

 bone. 



5. The same specimen seen from the outer aspect. 



6. Part of the right upper arm seen from the inner aspect, to show the internal 



articular plate. The two articulars are wanting, and the anconeal and 

 internal marginal, seen in impression, are broken off below. 



7. Dorsal surface of the right lower arm, or distal joint of the limb. Most of the 



bone has flaked off, leaving impressions of the plates and of their dividing 

 sutures. 



8. Impression of the external surface of a head, with natural mould of the 



interior of the orbital cavity. 



All these figures are of the natural size. 



