CTEXODOXTIDJE. 
251 
elliptical in form, with numerous strong, outwardly directed ridges, 
tuberculated or crenulated. Dorsal and anal Jins continuous with 
the caudal. 
The remains of this genus and of the closely allied Sa- 
genodus (p. 255) are usually very fragmentary, and the paired 
fins still remain unknown. The so-called Campylopleuron shows 
the form of the tail ; but the only tolerably complete individuals 
hitherto discovered 1 are too imperfectly preserved for satisfactory 
discussion. A general review of the principal skeletal features 
already discovered is given by W. J. Barkas 2 , Miall 3 , and 
Fritsch 4 . Cranial roof-bones are also discussed and figured 
by Hancock and Atthey 5 and T. P. Barkas 6 ; the palate is 
described by Miall T , Hancock and Atthey 8 , and T. P. Barkas 9 ; 
the mandible by Atthey 10 ; and the teeth especially by Hancock 
and Atthey 11 and W . J. Barkas 12 . The scales are first described and 
figured by Hancock and Atthey ]3 . 
Ctenodus cristatus, Agassiz. 
[Plate IV. fig. 1.] 
1826. u Palate/’ J. De C. Sowerby, Zool. Journ. vol. ii. p. 28, pi. ii. fig. 2. 
1838. Ctenodus cristatus , L. Agassiz, Poiss. Foss. vol. iii. p. 137, pi. xix. 
fig. 16. 
1868. Ctenodus cristatus, T. Atthey, Ann. Mag. Nat. Hist. [4] vol. i. 
p. 83. 
1868. Ctenodus tuberculatus, T. Atthey, ibid. p. 83. [Lower dental 
plates ; Newcastle-on-Tyne Museum.] 
1 Hancock & Atthey, Nat. Hist. Trans. Nortlmmb. & Durham, vol. iii. p. 55; 
A. Fritsch, Fauna cler Gaskolile, kc., Boh mens, vol. ii. p. 93, pi. lxxx. b. 
2 Proc. Boy. Soc. N. S. Wales, vol. x. (1877), pp. 99-123, and ibid. vol. xi. 
(1878), pp. 51-64. 
3 L. C. Miall, “ On some Bones of Ctenodus Proc. Yorksh. Geol. k Polyt. 
Soc. n. s. vol. vii. 1880, pp. 289-299, with figs. 
4 A. Fritsch, Fauna der Gaskohle, &c., Bohmens, vol. ii. pt. 3 (1888). 
5 Nat. Hist. Trans. Northumb. & Durham, vol. iv. p. 401. 
6 Coal Meas. Palseont. 1873, p. 113, figs. 244-246. 
7 Quart. Journ. Geol. Soc. vol.xxx. (1874), p. 772, pi. xlvii. 
8 Nat. Hist. Trans. Northumb. & Durham, vol. iv. p. 399, pi. xiv. 
9 Coal Meas. Paleeont. p. 114, fig. 247. 
10 Nat. Hist. Trans. Northumb. & Durham, vol. v. p. 227, pi. v. figs. 1, 2. 
11 Ibid. vol. iii. p. 61 (dental plate). 
12 Proc. Boy. Soc. N. S. Wales, vol. x. (1877), pp. 99-109, with figs, 
(palatine dental plates); ibid. p. 115 (vomerine teeth). See also T. Atthey, 
Nat. Hist. Trans. Northumb. & Durham, vol. v. (1875), p. 228, pi. v. fig. 4 
(vomerine teeth). 
13 Nat. Hist. Trans. Northumb. k Durham, vol. iii. p. 55 ; and loc. cit. vol. iv. 
p. 398, pi. xiii. fig. 3, p. 417, pi. xvi. 
