﻿CCELACANTHIDJE. 407 



Ccelacanthus huxleyi, Traquair. 



[Plate XIV. fig. 1.] 



1881. Ccelacanthus huxleyi, R. H. Traquair, Trans. Roy. Soc. Edinb. 



vol. xxx. p. 20, pi. i. figs. 1-4. 

 1888. Rhabdoderma huxleyi, O. M. Reis, Palaeontogr. vol. xxxv. p. 5. 



Type. Imperfect fishes ; Geological Survey of Scotland. 



A small species, attaining a maximum length of about 0-18. 

 Trunk robust but elongated ; head with opercular apparatus occu- 

 pying about one fourth of the total length. Dorsal fins of relatively 

 large size, the first consisting of very stout rays and situated slightly 

 in advance of the pelvic pair, the second consisting of more 

 numerous slender rays ; principal caudal fin comprising about 14 

 stout rays above and below. Jugular plates four times as long as 

 broad, ornamented with few, delicate, concentric striae ; opercular 

 bones three-quarters as broad as deep, smooth or feebly striated ; 

 head-bones in part marked with few coarse striae, sometimes divided 

 into elongated tubercles ; scales externally ornamented with very 

 delicate, widely spaced, posteriorly converging striae. 



Form. <$f Loc. Calciferous Sandstones (Cement-stone Group) : 

 Eskdale, Dumfriesshire. 



P. 4079 a. Large individual, in counterpart, wanting terminal 

 caudal fin, probably originally about 0*18 in total length. 

 A jugular plate, the opercular bones, and calvicle. as 

 preserved, exhibit none but the faintest external ornamen- 

 tation ; but one of the cheek-plates is externally marked 

 with a few coarse concentric striae and irregular tubercles. 



Purchased, 1883. 



P. 4079 b. Specimen about 0-105 in length, with imperfect head 

 and fins. Purchased, 1883. 



P. 4080 a. Small individual showing the terminal caudal fin, 

 represented, of the natural size, in PI. XIY. fig. 1, the 

 scales and jugular plate being enlarged three times in 

 figs. 1 a, 1 b. Purchased, 1883. 



P. 4080 b. Similar specimen, displaying the dorsal fins. 



Purchased, 1883. 



P. 4079-80. Six small fishes, some showing smooth opercular bones. 



Purchased, 1883. 



P. 5983. Small individual. Purchased, 1889. 



