264 ROYAL SOCIETY OF CANADA 
extremities of the pair of central plates; no median element over the 
pineal region and no foramen; orbits forming broad notches, not 
bounded externally. (Arrangements of plates upon trunk unknown, 
but probably as in Coccosteus.)” 
“So far as known, the species of this genus do not exceed those 
of Coccosteus in size.” 
When this description was written, there were three imperfect 
cranial shields and a detached plate, of the typical species of the genus, 
in the Geological Department of the British Museum. 
Shortly after the publication of the second part of the British 
Museum Catalogue of Fossil Fishes, some fish remains from Campbell- 
ton, that had been collected by Mr. Jex in 1891, were acquired for ~ 
the Geological Department of that institution. This part of Mr. Jex’s 
1891 collection forms the subject of a paper by Dr. A. Smith Wood- 
ward in the Geological Magazine for January, 1892, and includes 
several additional specimens of Phlyctænaspis. In regard to these 
latter, Dr. Woodward writes as follows :— 
“ Of several specimens referable to the type species of Phlyctenaspis, 
two are especially fine—one exhibiting the outer aspect of the head- 
shield, the other the inner or visceral aspect of the same. The former 
is shown of the natural size in PI. I, fig. 7,” (the Pl. IV, fig. 2 of 
this paper), “and of the latter the so-called “ rostral” plate is separ- 
ately represented in fig. 8” (the Pl. IV, fig. 3 of this paper). “The 
first specimen is of great interest as having been crushed in such a 
manner as to separate its component elements; while both specimens 
elucidate for the first time the precise nature of the ‘ rostral plate.’ 
“The new specimens demonstrate that Dr. Traquair’s determination 
of the arrangement of the various elements of the shield is correct in 
every particular; and it is especially interesting to find that in the 
original of fig. 7” (Pl. IV, fig. 2 of this paper) “ there is an anterior 
pair of bones (p. ma), additional to those previously discovered and 
evidently homologous with the premaxille (Traquair) of Coccosteus. 
“The statement that no median bone occurs over the pineal region 
of Phlyctenaspis, made in the Catal. Foss. Fishes Brit. Mus., pt. ii, 
p. 277, must now be modified; for both the new specimens under 
consideration show the small pineal plate (posterior ethmoid of Tra- 
quair) fused with the large ethmoid (anterior ethmoid of Traquair) 
in front, but separated by a distinct sutural line. The great pineal 
pit at the hinder angle of the “rostral” plate thus formed is well 
indicated in Pl. 1, fig. 8” (the Pl. IV, fig. 3 of this paper). 
“ Several plates of the body cuirass are also contained in the latest 
collection from Campbellton. There are examples of the lateral and 
