﻿cwimmridm, 73 



Genus EDAPHODON, Auckland. 



[Proc. Geol. Soc. vol. ii. 1838, p. 687 \] 



Syn. Passalodon, W. Buckland, ibid. 



Psittacodon, L. Agassiz, Poiss. Foss. vol. iii. 1843, p. 340 (in 



part). 

 Eumylodus, J. Leidy, Extinct Vert. Fauna W. Territ. (Rep. U. S. 



Geol. Surv. Territ. vol. i. 1873), p. 309. 

 Dipristis, 0. C. Marsh, Proc. Amer. Assoc. Adv. Sci. 1869, p. 230. 



Mandibular tooth massive, with no definite thickening upon the 

 outer aspect, and the symphysial facette very broad ; one anterior 

 tritor present, and sometimes a smaller one below it ; one median 

 tritor, occasionally divided longitudinally, and two external tritors. 

 Palatine teeth very robust, with no well-defined thickening upon 

 the outer aspect ; three tritors present, two being inner and one 

 outer. Vomerine tooth more or less triangular in side view, with 

 tritors upon the oral margin ; post-oral region laterally expanded, 

 without any thickening. 



The name of Passalodon was applied by Buckland to the vomerine 

 teeth, and that of Psittacodon by Agassiz to the mandibular teeth 

 of E. mantelli and E. sedgwicki. 



Edaphodon sedgwicki (Agassiz). 



1843. Chimcera {Psittacodon) sedgiuickii, L. Agassiz, Poiss. Foss. vol. 



iii. p. 349, pi. xl. figs. 17, 18. 

 1843. Ischyodus sedgwicki, Sir P. Egerton, Proc. Geol. Soc. vol. iv. 



p. 156. 

 1847. Edaphodon sedgwicki, Sir P. Egerton, Quart. Journ. Geol. Soc. 



vol. iii. p. 352. 

 1850. Edaphodon sedgioicki, F. Dixon, Foss. Sussex, p. 203. 

 1864. Edaphodus huxleyi, H. G. Seeley, Ann. Mag. Nat. Hist. [3] 



vol. xiv. p. 276 (name only). [Fragmentary teeth ; Woodwardian 



Museum, Cambridge.] 

 1878. Edaphodon sedgioickii, E. T. Newton, Chirnaeroid Fishes Brit. 



Cret. Rocks (Mem. Geol. Surv., Monogr. iv.), p. 7, pis. i., ii. 



Type. Imperfect right mandibular tooth ; Mus. Geological Society 

 of London. 



A species attaining to a very large size, the measurement from 

 the middle of the symphysial border to the extremity of the post- 

 oral margin of the mandibular tooth being sometimes 0*15. Man- 

 dibular tooth with a very prominent beak, and the symphysial 



1 This genus was first satisfactorily defined by Egerton, Quart. Journ. Geol, 

 Soc. vol. iii. (18^7), p. 351, pi. xiii. figs. 2, 3. 



