﻿250 



SIEE^OIDEI. 



Uronemus splendens, Traquair. 

 [Plate IV. fig. 5.] 



1881. Ganopristodus splendens, R. II. Traquair, Geol. Mag. [2] vol. viii. 

 p. 37. 



1882. Ganopristodus splendens, R. II. Traquair, ibid. vol. ix. p. 543. 

 1890. Uronemus splendens, R. H. Traquair, ibid. [3] vol. vii. p. 252. 



Type. Jaws ; collection of Dr. R. H. Traquair. 



A species of somewhat larger size than the type ; head and 

 opercular apparatus occupying at least one quarter of the total 

 length. Marginal teeth sometimes in part serrated, otherwise as in 

 the type species. Scales oval, sometimes truncated, dull and smooth. 



This is the type species of the so-called Ganopristodus. 



Form, fy Loc. Middle Carboniferous Limestone (Blackband Iron- 

 stone) : Borough Lee, near Edinburgh, 



P. 5986. Fragment of mandible with teeth, partly shown, of the 

 natural size, in PI. IV. fig. 5. Purchased, 1889. 



Family CTENODONTJD^E. 



Cranial roof-bones numerous ; no distinctly differentiated max- 

 illa or premaxilla, and no marginal series of teeth above or below ; 

 jugular plates absent. Caudal fin diphycercal. Scales more or less 

 cycloid. 



Synopsis of Genera. 

 One median occipital plate ; dental plates with 



numerous ridges Ctenodus (p. 250). 



Two median occipital plates ; dental plates with 



fewer ridges Sagenodus (p. 255). 



Genus CTENODUS, Agassiz. 



[Poiss. Foss. vol. iii. 183S, p. 137.] 



Syn. (?) Campy lopleuron, T. H. Huxley & E. P. Wright, Trans. Roy, 

 Irish Acad. vol. xxiv. 18G7, p. 353. 



Body depressed, covered with large thin scales, almost quadrate 

 in shape, but having the angles well rounded ; both scales and 

 external bones destitute of a ganoine-layer. A single median 

 occipital plate, with a pair of plates immediately adjoining in front. 

 Dental plates, above and below, triangular, irregularly ovate, or 



