﻿CTEN0D0NT1DJ4. 2fOO 



Ctenodus murchisoni, Ward. 



[Plate IV. fig. 4.] 



1843. Ctenodus alatus, L. Agassiz, Poiss. Foss. vol. iii. p. 174 (name 

 only). 



1844. Ctenodus murchisoni, L. Agassiz, Poiss. Foss. vol. i. p. xxxv 

 (name only). 



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

 Engin. vol. x. p. 15G. 



Type. Palatine dental plate ; British Museum. 



Palatine dental plate attaining a length of about 0*7 and a 

 maximum breadth of 0*04, irregularly oval in shape ; coronal 

 surface more or less concave, with about twenty small, acute, 

 coarsely tuberculated ridges, scarcely radiated. 



Form. § Loc. Upper Coal-Measures (Spirorbis Limestone) : Shrop- 

 shire and Lancashire. Middle Coal-Measures (Bassey Mine Iron- 

 stone) : Staffordshire. 



P. 518. Type specimen labelled in Agassiz's handwriting, shown, of 

 the natural size, in PI. IV. fig. 4; Leebotwood. The 

 dental plate is of the left side, and the margins towards 

 the anterior extremity are much broken. Egerton Coll. 



The following species has also been described : — 



Ctenodus wagneri, J. S. Xewberry, Palseoz. Fishes N. America 



(Mon. U.S. Geol. Surv. no. xvi. 1889), p. 172, pi. xxvii. 



fig. 30. — Cleveland Shale (Lower Carboniferous) ; Ohio. 



[Columbia College, New York.] 



The following species seems to be founded upon an abraded 

 dental plaie of Ctenodus : — 



Conchodus plicatus, J. W. Dawson, Acadian Geol. ed. 2 (1868), 

 p. 209, fig. 53. — Coal-Measures; Nova Scotia. [Eedpath 

 Museum, Montreal.] 



Genus SAGENODUS, Owen. 

 [Trans. Odontol. Soc. vol. v. 1867, p. 365.] 



Syn. Petalodopsis, W. J. Barkas, Monthly Rev. Dental Surgery, vol. ii. 



1874, p. 538. 

 Ptyonodus, E. D. Cope, Proc. Amer. Phil. Soc. vol. xvli. 1878, 



p. 192. 

 Megapleuron, A. Gaudry, Enchainements du Monde Animal, 



Foss. Primaires, 1883, p. 239. 

 Hemietenodus, O. Jaekel, Sitzungsb. Ges. naturf. Freunde, 1890, 



p. 7 (in part). 



