﻿CEPHALASPID^E. 



191 



1890. Cephalaspis campbelltoivnensis, R. H. Traquair, Geol. Mag. [3] 



vol. vii. p. 21. 

 1890. Cephalaspis whiteavesi, R. H. Traquair, ibid. p. 21. [Shield; 



Edinburgh Museum.] 



Type. Shield ; Geological Survey Museum, Ottawa. 



A species of large size, the shield with cornua attaining a length 

 of not less than 0*18. Shield produced anteriorly into a short, nar- 

 row, sharply rounded rostrum ; orbits placed nearly midway between 

 the anterior and posterior margins ; cornua long, broad at the base, 

 acutely pointed, slightly inflected, and finely denticulated on the 

 inner margin. Cornua ornamented with fine reticulating rugse ; 

 [ornament of shield unknown]. 



The peculiar rostrum of this species is solid, much resembling 

 that of Pteraspis. It is well shown in the type specimen, though 

 accidentally omitted in the original description and restored outline. 

 As remarked by Whiteaves, the relative proportions of the orbits 

 and interorbital space vary considerably — the result, probably, of 

 accidental crushing. 



Form. <$f Loc. Lower Devonian ; Campbellton, New Brunswick. 



P. 5477. Slab of shaly rock with remains of four shields, associated 

 with fragments of Phlyctcenaspis and plants. 



Purchased, 1888. 



P. 5970. Remains of a very large shield, with orbits and one cornu. 



Purchased, 1889. 



P. 5478. Crushed shield with cornua. Purchased, 1888. 



P. 5479. Anterior two-thirds of shield, with rostrum, shown, of 

 two-thirds the natural size, in PI. IX. fig. 5. 



Purchased, 1888. 



P. 4576, Similar specimen, with rostrum relatively shorter and more 

 acutely pointed. Purchased, 1888. 



P. 5971. Fragment with rostrum. Purchased, 1889. 



P. 5480. Imperfect impression of inner aspect of shield, with the 

 inferior rim. Purchased, 1888. 



P. 5971 a. Fragment showing part of the hinder border of the 

 shield. Purchased, 1889. 



P. 5974. Fragmentary squamation, probably of this species. The 

 scales are ornamented with very fine tubercles often fused 

 in series. Purchased, 1889. 



