﻿CTEN0D0NT1P E. 257 



1873. Ctenodus monoceros, T. P. Barkas, ibid. p. 28, fig. 87. [Dental 

 plate ; collection of T. P. Barkas, Esq.] 



1873. Ctenodus quadra/its, T. P. Barkas, ' English Mechanic/ vol. xviii. 

 p. 68, woodc. 1, 2. [Ditto.] 



1874-75. Petalodopsis mirabilis, W. J. Barkas, Monthly Rev. Dental 

 Surgery, vol. ii. p. 538, figs, xxx.-xxxii., and ibid. vol. iii. p. 4, 

 figs, xxxiii.-xxxv. [Vomerine tooth.] 



1874. Ceratodus barrandei, A. Fritsch, Sitzungsb. k. bohm. Ges. Wiss. 

 p. 193 (first determined as probably referable to C. obliquus 

 by L. C. Miall, Palaeont. Indica, [4] vol. i. pt. ii. 1878, p. 17). 

 [Dental plates ; Royal Bohemian Museum.] 



1875. Ctenodus obliquus, T. Atthey, Ann. Mag. Nat. Hist. [4] vol. xv. 

 p. 309, pi. xix. (reprinted in Nat. Hist. Trans. Northumb. & 

 Durham, vol. v. 1877, p. 227, pi. v.). 



1875. Ctenodus obliquus, imbricatus, and ellipticus, J. Ward, [Proc] N. 



Staffs. Nat. Field Club, pp. 246, 247. 

 1877. Ctenodus obliquus, elegans, imbricatus, ellipticus, monoceros, and 



quadratus, W. J. Barkas, Proc. Roy. Soc. N. S. Wales, vol. 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. 



vol. vii. p. 291, woodc. fig. 4. 

 1888. Ctenodus obliquus, A. Fritsch, Fauna der Gaskohle, vol. 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. 



vol. 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 ,0. Jaekel, Sitzungsb. Ges. naturf. Freunde, 



p. 7 

 1890. Hemictenodus obliquus, R. H. Traquair, Geol. Mag. T3] vol. vii. 



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. elegans 

 are regarded as referable to young individuals of this species ; and 



PART II. s 



