THE 



GEOLOGICAL MAGAZINE 



NEW SERIES. DECADE 111. VOL. IX. 



No. XI.— NOVEMBER, 1892. 



I. — Further Contributions to Knowlkdge of the Devonian Fish- 

 fauna OF Canada. 



By Arthur Smith Woodward, F.L.S., F.G.S. 

 (PLATE XIII.) 



EAELY in the year the present writer published some notes on 

 the Lower Devonian Fishes of Campbellton, New Brunswick 

 collected by Mr. Jex in the summer of 189L^ Since that date the 

 remainder of the collection, comprising a very large series of speci- 

 mens from the Upper Devonian of Scaumenac Bay, in the Province 

 of Quebec, has been acquired by the British Museum ; and materials 

 are thus forthcoming for some further observations. 



I. On the Body-armour of Phlyctoenaspis acadica. 



Before, however, proceeding to a consideration of the fishes of the 

 Upper Devonian, a few additional examples of Phbjctce.naspis from 

 Campbellton are worthy of brief note, in reference to the body- 

 armour. The presence of a number of plates, much resembling 

 those of the ordinary Goccosteus, has already been determined by 

 Whiteaves ; ^ the median dorsal and the ventro-lateral plates beino- 

 especially similar. It is also evident, from certain of the new 

 specimens (Brit. Mus., Nos. P. 6574-75), that the body-armour in 

 Phli/ctcenaspis is articulated with the head-shield by means of a boss 

 on each anterior dorso-lateral plate, exactly as in Goccosteus. There 

 are, nevertheless, certain small plates that cannot be placed with 

 reference to the last-named familiar genus; and it is not unlikely 



that some of these — notably the symmetrical, ridged examples will 



prove to occur on the otherwise unarmoured tail. 



But the most striking feature in the body-armour of FMyctcenaspis, 

 now shown for the first time, is the presence of a pair of fixed 

 spines, each apposed in the greater part of its extent to a lateral 

 plate of the trunk (Fig. 1). These spines are robust but hollow, 

 compressed, very slightly arched, tapering at both ends, and marked 

 with irregular longitudinal series of tubercles. They are, indeed, 

 precisely similar in external form and appearance to those of 



"^^ 1 Smith Woodward, " On the Lower Devonian Fish-Fauna of Campbellton New 

 Brunswick," Geol. Mag. Dec. III. Vol. VIII. pp. 1-6, PI. I. (1892). 



- J. F. Whiteaves, " Illustrations of the Fossil Fishes of the Devonian Rocks of 

 Canada, Part I.," Trans. Eoy. Soc. Canada, vol. vi. sect. iv. pp. 94 95 pi ix 



DECADE III. VOL. IX. — NO. XI. 3i 



