Dr. R. H. Traquair — Devonian Fishes of Canada. 21 



The difference in the form of those bones of the cranial shield 

 seems to me certainly to be of generic importance, and I doubt not 

 but that many other important differences would be apparent were 

 the remains more complete. (I may remark that the plate figured 

 by Mr. Whiteaves as a " ventro-median (?) plate" cannot be so, as 

 it is not bilaterally symmetrical.) I therefore propose for it the 

 generic name Phlyct&nius. 



It is also of considerable interest to note that the Edinburgh 

 Museum also possesses a small Coccostean head from Cradley, 

 Herefordshire, which is referable to the same genus as the above. 

 A description of this, the first known Coccostean from the West 

 of England, is reserved for the next Number of the Geological 

 Magazine. 



Cephalaspid^. 



Cephalaspis Campbelltownensis, Whiteaves. — Mr. Whiteaves men- 

 tions as a character of this species that the surface displays little 

 pits instead of the characteristic tuberculation. The outer surface does 

 not seem to me to be preserved in the Campbelltown Cephalaspidse 

 any more than it is in those from some localities in Forfarshire. 



In its contour the shield of C. Campbelltownensis is, however, 

 proportionally considerably broader than in C. Lyelli, though this 

 may partly be due to these shields in the Campbelltown deposits being 

 always crushed out quite flat. The orbits are proportionally further 

 back from the front of the shield. 



Cephalaspis Whiteavesi, sp. nov., Traq. — Buckler triangular in 

 general appearance, rather acutely and conspicuously pointed in 

 front, cornua rather prolonged and incurved, or hits large, polygonal 

 tessellation somewhat coarse. Surface ornament not seen. 



This is a most striking form, no hitherto described species of 

 Cephalaspis having that remarkably pointed anterior contour which 

 indeed reminds us of the front of a Skate. I beg therefore to 

 dedicate the species to Mr. Whiteaves, who has been the first to 

 describe the fishes from Scaumenac and Campbelltown. 



ACANTHODID.E. 



Mr. Smith Woodward has already pointed out that the species 

 named by Whiteaves Ctenacanthus latispinosus and Homacanthus 

 gracilis are Acanthodian in their nature, and are not distinguishable 

 from those of Climatius. 1 



Gyracanthus. 



A veritable Selachian ichthyodorulite has, however, turned up in 

 the shape of a new species of Gyracanthus, to which I apply the 

 name G. incurvus. The length of the spine is 2^ inches, but though 

 the point is entire, some of the base has been lost, so that originally 

 it must have been a little longer. It shows an anteroposterior 

 curvature of a very much stronger and more pronounced description 

 than is found in the young forms of any hitherto described species, 

 and this together with the great delicacy of its ornamentation dis- 

 tinguishes it as new. The ornamentation consists of rather fine 

 1 Ann. and Mag. Nat. Hist. (6) iv. p. 183. 



