14 
ICHTHYOTOWI. 
Diplo&us bohemicusj Qnenstedt. 
1882. Diplodus bohemicus, F. A. Quenstedt, Handb. Palseont. 3rd edit, 
p. 277, pi. xxi. figs. 35-37. 
Type. Detached tooth. 
Adult teeth equalling those of D. latus in size, and apparently 
only differing in the somewhat greater length and slenderness of the 
anterior median denticle. 
Form, Log. Lower Permian (Gaskohle): Bohemia. 
47484. Two large teeth, almost perfect; Kounova, near Rakonitz. 
Purchased , 1876. 
P. 3032. Similar tooth ; Kounova. Enniskillen Coll. 
47486. Two small teeth, probably of this species ; Nyran, near 
Pilsen. Purchased , 1876. 
The following species have also been founded upon detached 
teeth, but there are no examples in the Collection :— 
V 
V 
Diplodus bicornis : Thrinacodus bicornis , J. S. Newberry, Ann. 
Rep. Geol. Surv. Indiana, 1879, p. 344.—St. Louis Lime¬ 
stone ; Indiana. 
Diplodus duplicatus, Newberry & Worthen, Pal. Illinois, vol. ii. 
(1866), p. 61, pi. iv. fig. 3; Thrinacodus duplicatus , St. 
John & Worthen, Pal. Illinois, vol. vi. (1875), p. 289. 
—Keokuk Limestone ; Illinois. 
Diplodus incurvus , Newberry & Worthen, tom. cit. p. 62, pi. iv. 
fig. 4; Thrinacodus incurvus, St. John & Worthen, tom. 
cit. p. 289.—Keokuk Limestone ; Illinois. 
Diplodus levidens: Orthacanthus levidens, A. Fritsch, Sitzungsb. 
konigl. bohra. Ges. Wiss. 1879, p. 189 (undefined).— 
Lower Permian ; Kounova, Bohemia. 
Diplodus nanus : Thrinacodus nanus , St. John & Worthen, tom. 
cit. p. 289, pi. v. figs. 1, 2.—Kinderhook Limestone ; Iowa. 
Diplodus penetrans, J. W. Dawson, Acadian Geology, Suppl. Chap¬ 
ter, 1860, p. 50, fig. 42; also op. cit. 3rd edit. (1878), 
p. 211, woodc. fig. 57.—Coal-Measures ; Nova Scotia. 
Diplodusplicatus, A. Fritsch, loc. cit. 1879, p. 189 (undefined).— 
Lower Permian ; Knezoves, Bohemia. 
Skulls of two species from the Permian of Texas, possessing 
teeth generically identical with those named Diplodus , have been 
described by Prof. E. D. Cope under the names of Didymodus 
texensis and D. platypternus. The pterygo-quadrate cartilage 
articulates with the postorbital process of the cranium, and the 
