CTEXODONTIDiE. 257 
1873. Ctenodus monoceros, T. P. Barkas, ibid. p. 28, fig.' 87. [Dental 
plate ; collection of T. P. Barkas, Esq.] 
1873. Ctenodus quadratus, T. P. Barkas, 1 English Mechanic,’ yoI. xviii. 
p. 68, woodc. 1, 2. [Ditto.] 
1874-75. Petalodopsis mirabilis , W. J. Barkas, Monthly Bey. Dental 
Surgery, vol. ii. p. 538, figs, xxx.-xxxii., and ibid. yol. iii. p. 4, 
figs, xxxiii.-xxxy. [Vomerine tooth.] 
1874. Ceratodus barrandei , A. Fritsch, Sitzungsh. k. bohm. Ges. Wiss. 
p. 193 (first determined as probably referable to C. obliquus 
by L. C. Miall, PalEeont. Indica, [4] yol. i. pt. ii. 1878, p. 17). 
[Dental plates; Boyal Bohemian Museum.] 
1875. Ctenodus obliquus , T, Atthey, Ann. Mag. Nat. Hist. [4] yol. xy. 
p. 309, pi. xix. (reprinted in Nat. Hist. Trans. Northumb. & 
Durham, yol. y. 1877, p. 227, pi. y.). 
1875. Ctenodus obliquus, imbricatus, and ellipticus, J. Ward, [Proc.] N. 
Staffs. Nat. Field Club, pp. 246, 247. 
1877. Ctenodus obliquus, elegcins, imbriccitus, ellipticus, monoceros, and 
quadratus, W. J. Barkas, Proc. Boy. Soc. N. S. Wales, yol. x. 
pp. 105-108, figs. 3, 5-7, 12, 13, 20, 21. 
1877. “Vomerine teeth of Ctenodus ,” W. J. Barkas, ibid. p. 115, 
figs. 14-19. 
1881. Ctenodus obliquus, L. C. Miall, Proc. Yorksh. Geol. & Polyt. Soc. 
yol. yii. p. 291, woodc. fig. 4. 
1888. Ctenodus obliquus, A. Fritsch, Fauna der Gaskohle, yol. ii. 
p. 66, pis. lxxi.-lxxix., pi. lxxx. figs. 5-12, and woodcuts. 
1890. Ctenodus obliquus, Woodward & Sherborn, Catal. Brit. Foss. 
Vertebrata, p. 52 (synonymy). 
1890. Ctenodus obliquus , J. Ward, Trans. N. Staffs. Inst. Mining Engin. 
yol. x. p. 155, pi. iii. fig. 5. 
1890. Ctenodus imbricatus, J. Ward, ibid. p. 155. 
1890. Ctenodus ellipticus, J. Ward, ibid. p. 155, pi. iii. fig. 6. 
1890. Hemictenodus obliquus,O. Jaekel, Sitzungsb. Ges. naturf. Freunde, 
P- 7 
1890. Hemictenodus obliquus, B. H. Traquair, Geol. Mag. [3] yol. yii. 
p. 251. 
Type. Section of lower dental plate ; British Museum. 
The type species. Palatine dental plate elongated, attaining a 
length of about 0-055 and a maximum breadth of 0-025 ; outer 
margin often nearly straight, inner border regularly arched; coronal 
surface flat or concave, with six or seven (rarely more) large, 
acute, very prominent radiating ridges, coarsely crenulated at 
the abrupt outer margin, more finely crenulated or smooth towards 
the inner margin. Mandibular dental plate only differing from the 
palatine in its comparative narrowness. 
By A. Fritsch (op. cit. 1888) the dental plates named C. elegcins 
are regarded as referable to young individuals of this species; and 
PAET II. 
s 
