88 
CHIMJEROIDEI. 
Genus ELASMODECTES, NewW. 
[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 willettii, E. T. Newton, Chimseroid Fishes Brit. 
Cret. Bocks (Mem. Geol. Surv., Monogr. iv.), p. 43, pi. xii. 
figs. 13-15. 
1888. Elasmodectes willettii , 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, df Loc. Turonian : Sussex and Kent. 
47944. Imperfect right mandibular tooth, inner aspect, noticed by 
Newton, op. eit. p. 44 ; Lower Chalk, Burham, Kent. 
Presented by the Hon. Robert Marsham , 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 w r as suggested by the present writer, 
Proc. Geol. Assoc, vol. x. (1888), p. 301. 
