12 
icnraroTOMi. 
Diplodus parvulus, Traijuair. 
1881. Diplodus parndus, R. H. Traquair, Qeol. Mag. [2] vol. viii. 
p. 30. 
Type. Detached teeth ; Traquair Collection. 
Teeth of comparatively small size. Principal cones slightly 
compressed, with sharp edges; coronal surface smooth; median 
denticle in the form of a blunt lobulated boss ; posterior “button” 
present. 
Form. ^ Loe. Middle Carboniferous Limestone : Edinburgh. 
P. 4495. Six specimens ; Blackband Ironstone, Borough Lee, near 
Edinburgh. Two of the teeth are showq, of the natural 
size, in PI. VI. figs. 5, 6, both showing the anterior aspect. 
Presented hy 11. H. Traquair, Esq., M.D., 1884. 
P. 2295. Similar small tooth ; Loanhead. Purchased, 1882. 
Diplodus latus, Newberry. 
1850. Diplodus latus, J. S. Newberry, Proc. Acad. Nat. Sci. Philad. 
p. 99. 
1800, Diplodus latus, Newberry & Worthen, Pal. Illinois, vol. ii. p. 69, 
pi. iv. fig. 1. 
187.'}. Diplodus latus, J. S. Newberry, Rep. Geol. Surv. Ohio, vol. i. 
pt. ii. p. 336. 
1875. Diplodus lotus, J. S. Newberry, op. cit. vol. ii. pt. ii. p. 44, 
pi. Iviii. fig. 1. 
Type. Detached tooth. 
A comparatively large species. Principal cusps of dental crown 
extremely compressed and broad, with strongly serrated edges ; 
anterior median denticle small ; posterior “ button ” prominent. 
Anterior border of root produced downwards into an acute point. 
Form. ^ hoc. Coal-Measures : Illinois, Ohio, Indiana, U.S.A. 
P. 1720. Two imperfect teeth ; Linton, Ohio. Eyerton Coll. 
P. 3030. Imperfect tooth ; Linton. Enniskillen Coll. 
P. 3031. Portions of three teeth ; Posey Co., Indiana. 
Enniskillen Coll. 
Diplodus compressus, Newberry. 
1866. Diplodus compressus, J. S. Newberrv, Proc. Acad. Nat. Sci. 
Philad. p. 99. 
1860. Diplodus compressus, Newbcri-v & Worthen, Pal. Illinois, vol. ii. 
p. 00, pi. iv. fig. 2. 
