CLUPEID^. 
143 
caudal region comparatively stout and slightly longer than the 
abdominal region. Dorsal region much elevated, the margin rising 
to the origin of the dorsal lin, where it is almost angularly bent. 
Length of head with opercular apparatus equalling about two thirds 
the maximum depth of the trunk, which is nearlj or quite as great 
as its length from the pectoral arch to the base of the caudal fin. 
Abdominal vertebrae 14 to 16, caudals 18 in number. Pectoral fins 
with rays sufficiently long to reach the pelvic pair, which arise 
opposite the origin of the dorsal; dorsal fin longer than deep, with 
about 17 rays, its extent equalling the distance from the occiput to 
its origin, but much exceeding that from tlie caudal fin to its hinder 
end; anal fin much extended, with 25 rays, arising in advance of 
the hinder end of the dorsal. Dorsal scutes about twice as broad as 
long, with a longitudinal median keel; ventral ridge-scales about 
16 in number, not serrated, slightly increasing in size backwards. 
Form. Log. Upper Cretaceous : Hakel, Mt. Lebanon. 
P. 96. Type specimen, figured loc. cit. pi. i. fig. 3. Lewis Coll. 
P. 96 a. Smaller fish displaying the general form and proportions 
of the species, figured loc. cit. pi. i. fig. 4. Lewis Coll. 
P. 83. Imperfect fish apparently shortened by crushing, figured 
loc. cit. pi. i. fig. 2. Lewis Coll. 
P. 84, P. 86, P. 87. Three more imperfect specimens shortened and 
deepened by crushing. The second displays the left 
pectoral fin, the third the broad dorsal scutes, which 
exhibit two or three posterior denticulations on each side 
in addition to the median point. Lewis Coll. 
Diplomystus longicostatus. Cope. 
1886. Diplomystus longicostatus, E. D. Cope, Proc. Amer. Phil. Soc 
vol. xxiii. p. 3. 
1895. Diplomystus longicostatus, A. S. Woodward, Ann. Mag. Nat. 
Hist. [6] A’ol. XV. p. 2, pi. i. fig. 1. 
Type. Nearly complete fish ; Cope Collection. 
A deep-bodied species attaining a length of about O’13, the caudal 
region eomparatively small and slender, scarcely more than half a§ 
long as the abdominal region. Dorsal region much elevated, the 
margin rising to the origin of the dorsal fin. Length of head with 
opercular apparatus scarcely exceeding half the maximum dej)th of 
the trunk, which is nearly as great as its length from the pectoral 
arch to the base of the caudal fin. Abdominal vertebrae about 24 
in number, caudal vertebrae not more than 12. Pectoral fins small; 
