CEPHALASPIDiE. 



49 



4. EucEPiiALAsns Pagei. pi. X, figs. 3 and 4 ; PI. XI, fig. 4. 



Name. — After Mr. David Page, of Edinburgh, in accordance with the wish of 

 Mr. Powrie, the discoverer of this form. 



Strati (/raphical Position. — Lower Old Red Sandstone of Forfarshire. 



Characters. — The form of the head is very similar to that of C. Powriei ; but it is 

 difficult to be certain of its exact outline, since all the specimens obtained are much flat- 

 tened. Some, however, show this character better than seen in the figured specimens, 

 and from these the woodcut outline is drawn (fig. 21). The ornament is notably different 



from that of the several preceding species, for the tubercles are disposed in sets, consisting 

 of a central large tubercle, surrounded irregularly, more or less, with smaller tubercles. 

 The same character of marking is carried on to the scales. In one specimen (PI. X, 

 fig. 4) I could count about twenty pra)dorsal scales in a series ; but the specimens of 

 this species, though appearing very perfect at first sight, are so highly carbonized and 

 crushed that it is impossible to ascertain the true arrangement of the scales. Some seem 

 to indicate quite a different disposition of the series to that which I have described in 

 Eu. Lijellii and Ea. Powriei. The dorsal and caudal fins are well seen in some specimens, 

 but have not furnished any special characters ; in no specimen of this species have the 

 pectoral appendages yet been observed. The size of the majority of specimens is small. 

 They may be young individuals ; but their great number and the rare occurrence of large 

 specimens with them, which seem to belong to another species, leads to the supposition 

 that this is a Cephalaspis of small size when adult. At the same time it may prove to be 

 a younger form of the succeeding species. 



General RemarJcs. — ]\Ir. Powrie discovered this form in some abundance in a remarkable 

 bed of fine, dark, laminated shale and sandstone, which furnished also several Acanthodians, 



Fig. 21. 



Diagram outline of licad-shield of Fuccjj/ialaspix Pagei. 



1 



