﻿2o2 SIKEN01DEI. 



18(50. Ctenodus tuberculatus, T. P. Barkas & II. Woodward, Geol. 

 Mag. vol. vi. p. 317, pi. ix. 



1869. Ctenodus ovatus, T. P. Barkas, Scientific Opinion, vol. ii. p. 557. 

 [Upper dental plate ; collection of T. P. Barkas, Esq.] 



1870. Ctenodus cristatus, Hancock & Atthey, Nat. Hist. Trans. North- 

 umb. & Durham, vol. iii. pp. 61, 92. 



1870. Ctenodus tuberculatus, Hancock & Atthey, ibid. p. 61. 



1872. Ctenodus tuberculatus, Hancock & Atthey, ibid. vol. iv. pi. xiv. 



1873. Ctenodus tuberculatus, T. P. Barkas, Coal Meas. Pakeont. p. 28, 

 figs. 83, 84, 92. 



1873. Ctenodus ovatus, T. P. Barkas, ibid. p. 28, fig. 89. 



1873. Ctenodus concavus, T. P. Barkas, ibid. p. 28, fig. 88. [Abraded 

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



1874. Ctenodus cristatus, L. C. Miall, Quart. Journ. Geol. Soc. vol. xxx. 

 p. 772, pi. xlvii. 



1875. Ctenodus cristatus, L. C. Miall, Ann. Mag. Nat. Hist. [4] vol. xv. 

 p. 436. 



1875. Ctenodus cristatus, J. Ward, [Proc] N. Staffs. Nat. Field Club, 



p. 244, figs. 1, 2. 

 1875. Ctenodus tuberculatus, J. Ward, ibid. p. 246. 

 1877. Ctenodus cristatus, W. J. Barkas, Proc. Roy. Soc. N. S. Wales, 



vol. x. p. 102. 

 1877 Ctenodus tuberculatus, W. J. Barkas, ibid. p. 104, figs. 1, 10, 11, 



23. 

 1877. Ctenodus ovatus, W. J. Barkas, ibid. p. 108, fig. 8. 

 1877. Ctenodus concavus, W. J. Barkas, ibid. p. 106, tig. 4. 

 1888. Ctenodus cristatus, A. Fritsch, Fauna der Gaskohle, vol. ii. 



p. 77, woodc. figs. 155, 156. 

 1890. Ctenodus cristatus, J. Ward, Trans. N. Staffs. Inst. Mining 



Engin. vol. x. pp. 154, 156, pi. iii. figs. 3, 4. 

 1890. Ctenodus cristatus, Woodward & Sherborn, Cat. Brit. Fo^s. 



Vertebrata, p. 51 (synonymy). 



Type. Palatine dental plate ; Leeds Museum. 



The type species. Palatine dental plate broad-ovate or elliptical 

 in form, attaining a length of about 0*08 and a maximum breadth 

 of about 0*04 ; inner margin gibbous or gently rounded ; coronal 

 surface flat or slightly concave, with 12-14 acute, prominently 

 tuberculated ridges, only slightly radiated ; the tubercles laterally 

 compressed. Mandibular dental plate relatively narrower and 

 convex, similarly ridged. 



Form. $ Loc. Coal-Measures : England and South Scotland. 



P. 5031. Imperfect skull exhibiting the upper surface, shown, of 

 two-thirds the natural size, in PL IV. fig. 1 ; Great Eow 

 Coal, Clanway, North Staffordshire. The fragmentary 

 remains and partial impression of a palatine dental plate 



