ORDER GANOIDEI. 



967 



and pelvic fins, and the jaws are furnished with small conical 

 teeth. This genus is represented by several species in the 

 Devonian of Scotland, and not improbably also occurs in that 

 of Canada. Rhadinacanthus, from the Scottish Carboniferous, 



Fig. 899. — 1, Chiracantlws Murchisotii ; 2, Climatius scutiger ; 3, I schiiacauthus gracilis) 

 from the Devonian of Scotland. Reduced. 



has two in place of four pectoral spines ; while in Ischnacanthus 

 (fig. 899, 3), of the same deposits, the small intermediate spines 

 are wanting, although they are introduced in the figure. Allied 

 to the last are Euthacanthus and Parexus, from the Scottish De- 

 vonian, the former having the second dorsal in advance of the anal 



Fig. 900. — Diplacanthus striatus ; from the Devonian of Scotland ft, Pectoral 

 a, Anal ; c, Caudal ; d l , a" 2 , First and second dorsal fins. Reduced. 



Pelvic : 



fin. Finally, the genus Climatius (fig. 899, 2) includes three small 

 fishes from the last-named formation characterised by the short fin- 

 spines and the presence of a series of accessory spines between the 

 pectoral and pelvic fins. There are two dorsal fins, of which the 

 vol. 11. f 



