250 
sirexoidei. 
Ur on emus splendens, Traquair. 
[Plate IV. fig. 5.] 
1881. Ganopristodus splendens, R. H. Traquair, Geol. Mag. [2] vol. viii. 
p. 87. ' 
1882. Ganopristodus splendens , It. H. Traquair, ibid. vol. ix. p. 543. 
1890. TJronemus 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 anch—— 
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. Loo. Middle Carboniferous Limestone (Blackband Iron¬ 
stone) : Borough Lee, near Edinburgh. 
P. 5988. Fra gment of mandible with teeth, partly shown, of the 
natural size, in PI. IV. fig. 5. Purchased, 1889. 
Family CTENODONTJDiE. 
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 CTiEBJOlDUS, Agassiz. 
[Poiss. Foss. vol. iii. 1838, p. 137.] 
Syn. (?) Campylopleuron, T. H. Huxley & E. P. Wright, Trans. Roy. 
Irish Acad. vol. xxiv. 1867, 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 
