A. 8. Woodward — -Devonian Fishes, Canada. 3 



with a single regular series of closely arranged, small stout denticles* 

 Lateral ornamentation delicate, consisting of numerous sharp ridges, 

 disposed with a very slight obliquity, which increases towards the 

 base and towards the anterior border ; the ridges coarsest and most 

 widely spaced at the base and at the anterior border, sometimes 

 smooth, sometimes in part crenulated. 



Four examples of this interesting ichthyodorulite are contained in 

 the new collection from Campbellton, and the finest specimen is 

 shown of the natural size in PI. I. Fig. 4, The fossil is imperfect in 

 the basal half, though exhibiting all the principal characters of the 

 species ; and the sharp oblique line of demarcation between the 

 inserted and exserted portions is conspicuous. Another specimen 

 seems to show distinct abrasion of the apex (PI. I. Fig. 5), such as 

 is a well-known feature of the typical Carboniferous Gyracantlms ; 

 and a third fragment has been sliced transversely to obtain a micro- 

 scopical section. The central cavity of the spine is tlius proved to 

 to have extended far towards the apex, and the tissue consists wholly 

 of vaso-dentine. 



Genus CLrMATius, Agassiz. 



[Poiss. Foss. V. G. R. 1845, p. 119'.] 



4. CUmatius latispinosus, Whiteaves, sp. 



1881-89. Cten acanthus latispinosus, J. F. Whiteaves, Canadian Xat. n.s. vol. x. 

 p. 99, and Trans. Eoy, Soc. Canada, vol. vi. sect. iv. p. 95, pi. x. fig. 3. 

 1889. A. S. Woodward, Ann. Mag. Nat. Hist. [6] vol. iv. p. 183. 



Numerous isolated spines of this large species of Acanthodian fisk 

 are contained in the collection. It is especially interesting to 

 observe that in addition to the ordinary fin-spin,es already known, 

 there are also some extremely broad and short triangular spines 

 precisely similar to the intermediate ventral spines of the typical 

 British specfes of CUmatius. These are marked with radiating, 

 sparsely tuberculated ridges, and their base of insertion is very 

 narrow. 



Genus Aoanthodes, Agassiz. 



[Poiss. Foss. vol. ii. pt. i. 1833, p. 19.] 



5. Aoanthodes semistriatus, sp. nov. PI. I. Fig. 3. 



Body much elongated and slender. Fin-spines much laterally 

 compressed, with a single deep and broad longitudinal groove 

 dividing each lateral face into a narrow smooth anterior area and 

 a somewhat wider, finely striated posterior area. Pelvic fins situated 

 nearer to the anal than to the pectorals, and the anal slightly in 

 advance of the dorsal. Pelvic fin-spine apparently almost as large 

 as the anal, and the latter much smaller than the dorsal. Scales 

 smooth, the surface faintly excavated or flat. 



The above definition is based upon a single imperfect fish 

 (No. P. 6545) about 0-15 in length, and having the dorsal fin-spine 

 0-02 in length. Two large detached spines, however, remarkably 

 similar to those of the type specimen, may probably be regarded 

 as indicating that the species sometimes attained to much larger 



