388 
ACTINOPTERYGII. 
P. 2100. Fish of nearly similar size and proportions apparently of 
this species, but, if so, with dorsal and anal tins incom- 
plete behiud ; Sendenhorat. Egerton Coll. 
Sphenocephalus cataphr actus, W. von dor March. 
1863. Sphenocephalus cataphractus, W. von der Marck, Palwontogr. 
vol. xi. p. 18, pi. iii. fig. 1, pi. vii. figs. 3-5. 
Type. Nearly comploto fish ; Academy of Munster. 
A slightly smaller species than the typo, with relatively larger 
head, length of head with opercular apparatus considerably ex- 
ceeding the maximum depth of the trunk, and contained one and a 
half times in the length from the pectoral arch to the base of the 
caudal fin. Dorsal fin with 9 divided rays ; anal fin arising oppo- 
site tho fifth or sixth of these rays, also comprising 9 divided rajs. 
Scales of lateral line about twice as deep as broad, two or three 
times as deep as those immediately below them. 
Form. Sf Loc. Upper Cretaceous : Westphalia. 
35039, P. 3824. Characteristic specimen, in counterpart ; Sendcn- 
horst. Purchased, 1860, if Enniskillen Coll. 
P. 2100 a. Fine specimen, displaying ornamented bead and scales 
in impression ; Sendenhorst. Egerton Coll. 
P. 3824 a. Imperfect fish, deepened by distortion ; Sendenhorst. 
Enniskillen Coll. 
Genus ACROGASTER, Agassiz. 
[Poiss. Foss. vol. iv. 1838, p. 5.] 
Syn. Acanlhiphoria, D. G. Kramberger, Djela Jugoslav. Akad. vol. X' >• 
1896, p. 46. 
Trunk much deepened and laterally compressed. Cleft of mouth 
large and oblique, and jaws with very minute teeth ; prcoperculmn 
with a few stout spines round the posterior border of its 1°" cl 
portion. Vertebrae about 12 in the abdominal, 14 in the cauda 
region. Pelvic fins arising below the origin of the pectorals, wit i 
one stout spine and (i or 7 divided rays. Dorsal fin occupying from 
a third to half of the back, with from 3 to 5 small slender spines 
and 10 to 14 stout divided rays ; anal fin only slightly loss ex 
tended, with 3 or 4 small stout spines and 9 to 11 well-space , 
stout, divided rays ; caudal fin deeply cleft. Scales thin, apparently 
cycloid, none thickened or enlarged along tho dorsal or ventra 
borders. 
