64 
SELACHII. 
Pristodus concinnus (Davis). 
1883. Pristicladodus concinnus , J. W. Davis, Trans. Roy. Dublin Soc. 
[2] vol. i. p. 385, pi. xlix. fig. 23. 
1884. Pristicladodus concinnus , J. W. Davis, Quart. Journ. Geol. Soc. 
vol. xl. p. 621, pi. xxvi. fig. 15. 
1888. Pristodus concinnus , R. H. Traquair, Geol. Mag. [3] vol. v. p. 102. 
Type. Imperfect tooth; Horne Collection, York Museum. 
Upper tooth probably similar to that of P. falcatus; lower tooth 
differing from the latter species in having the coronal apex produced 
into a narrow sharply-pointed prominence. 
Form. Sf Loc. Upper Carboniferous Limestone ; Yorkshire. 
49637-9. Three crushed lower teeth ; Richmond. 
Purchased, 1878. 
Pristodus benniei (R. Etheridge, jun.) 
1875. Petalorhynchus (P) benniei , R. Etheridge, jun., Geol. Mag. [2] 
vol. ii. p. 243, pi. viii. figs. 3, 4. 
1888. Pristodus benniei , R. H. Traquair, ibid. [3] vol. v. p. 101. 
Type. Upper tooth ; Coll. James Bennie. 
Coronal margin of upper tooth not dentated, but acuminate and 
smooth, with delicate punctations, like the margin of the lower 
tooth ; a prominent fold, with traces of others, is seen anteriorly at 
the base of the vertical portion of the crown. Lower tooth as in 
P. falcatus. 
All the known teeth of this species are small compared with those 
of the Yorkshire species; and if the non-dentated character of the 
margin of the upper tooth be eventually regarded as of generic 
value, Etheridge’s suggested name of Hoplodus may be adopted. 
Form, df Loc. Upper Carboniferous Limestone : Scotland: Derby¬ 
shire, England. 
46046. Crown of upper tooth, referred to by Etheridge, loc. cit .; 
Beith, Ayrshire. Presented by Robert Craig , Esq., 1874. 
P. 5344. Five imperfect upper teeth; Ticknall, near Melbourne, 
South DerbjAhire. Wilson Coll. 
P. 5344 a. Lower tooth, shown of nat. size in PI. I. fig. 13 ; Tick- 
nail. Wilson Coll. 
P. 5344 b. Four imperfect lower teeth ; Ticknall. Wilson Coll. 
P, 3015 h. Upper tooth doubtfully assigned to this species: Rich¬ 
mond, Yorkshire. This specimen appears to differ from 
the typical teeth only in size, Enniskillen Coll. 
