266 
ACTINOPTERYGII. 
1873), p. 292, pi. xix. figs. 15, 16.—Cretaceous ; Missis¬ 
sippi and New Jersey. [Fragments of splenial.] 
Pycnodus ricordeaui , H. E. Sauvage, Bull. Soc. Sci. Nat. Yonne, 
vol. xxxiii. pt. ii. (1879), p. 40, pi. ii. fig. 3.—Upper 
Cretaceous (Aptian); Gurgy, Yonne. [Left splenial.] 
Pycnodus robustus , J. Leidy, Proc. Acad. Nat. Sci. Philad. 1857, 
p. 168, and op. cit. 1873, p. 293, pi. xxxvii. figs. 18, 1Q{ 
—Cretaceous ; New Jersey. [Detached tooth.] 
Pycnodus varians , J. Cornu el, Bull. Soc. Geol. France, [3] vol. v. 
(1877), p. 610, pi. xi. fig. 7.— Neocomian; Massy, Haute 
Marne, France. [Bight splenial.] 
Genus COCCODUS, Pictet. 
[Descript. Poiss. Foss. Mont Liban, 1850, p. 51.] 
Trunk comparatively elongated and head relatively very large. 
Head and opercular bones ornamented with tubercles and fine 
ridges, and a large, ascending, laterally compressed, bilaterally 
symmetrical spine fixed upon the occipital region of the cranium; 
teeth smooth, but indented and partly mammillated, those of the 
vomer in at least three, and those of the splenial apparently in three 
regular series. Neural and hsemal arches of axial skeleton of trunk 
robust, but not expanding sufficiently to encircle the notochord. 
Fin-rays stout and well-spaced, articulated and branching distally. 
Pectoral arch much expanded at its inferior extremity, ornamented 
with fine ridges and tuberculations, produced behind into two 
large spines, and forwards into another. [Paired fins unknown;] 
dorsal and anal fins not much extended, opposed; caudal fin small 
and fan-shaped, having a convex posterior border. Squamation 
absent. 
Coccodus arHiatus, Pictet. 
[Plate XYI. fig. 4.] 
1850. Coccodus armatus, F. J. Pictet, Descript. Poiss. Foss. Mont 
Liban, p. 51, pi. ix. fig. 9. 
1887. Coccodus armatus , J. W. Davis, Trans. Boy. Dublin Soc. [2] 
vol. iii. p. 546, pi. xxx. fig. 1. 
Type. Vertically crushed head and anterior abdominal region; 
Geneva Museum. 
The type species, attaining a length of about 0*18. Head with 
opercular apparatus occupying about one-third of the total length 
of the fish. Occipital spine acuminate, its length considerably 
exceeding twice its maximum breadth, and about equalling two- 
