﻿88 CHIM.EK0IUE1. 



Genus ELASMODECTES, Newton l . 

 [Mem. Geol. Survey, Monogr. iv. 1878, p. 43.] 



Mandibular tooth much laterally compressed, with no definite 

 thickening upon the outer aspect, and the symphysial facette very 

 narrow ; anterior tritor divided into minute points ; median tritor 

 absent ; outer tritors represented by marginal series of minute 

 points. 



The upper teeth are still unknown. 



Elasmodectes willetti, Newton. 



1878. Elasmognathus icillettii, E. T. Newton, Chimaeroid Fishes Brit. 



Cret. Rocks (Mem. Geol. Surv., Monogr. iv.), p. 43, pi. xii. 



figs. 13-15. 

 1888. Elasmodectes tvillettn, A. S. Woodward, Proc. Geol. Assoc. 



vol. x. p. 301. 



Type. Associated right and left mandibular teeth ; Willett Col- 

 lection, Brighton Museum. 



The single known species, of small size, the mandibular tooth 

 measuring not more than 0*025 in length. 



Form. 6f hoc. Turonian : Sussex and Kent. 



47944. Imperfect right mandibular tooth, inner aspect, noticed by 

 Newton, op. cit. p. 44 ; Lower Chalk, Burham, Kent. 



Presented by the Hon. Robert Mar sham, 1877. 



49022, 49024. Left and right mandibular teeth, noticed, ibid. ; 

 Burham. Mrs. Smith's Coll. 



Genus ELASMODUS. Egerton. 



[Proc. Geol. Soc. vol. iv. 1843, p. 156.] 



Mandibular tooth much compressed, with no definite thickening 

 upon the outer aspect, and the symphysial facette narrow ; one 

 large, laminated, anterior tritor present, with one or two minute 

 ones below it upon the symphysis ; one large median tritor ; anterior 

 outer tritor almost or completely fused with the postero- superior 

 angle of the median ; posterior outer tritor laminated and divided 

 into several small parts. Palatine tooth very robust, with no well- 

 defined thickening upon the outer aspect ; four tritors represented, 



1 This genus was defined by Newton under the preoccupied name of Elasmo- 

 gnathus, and the modification here adopted was suggested by the present writer, 

 Proc. Geol. Assoc, vol. x. (1888), p. 301. 



