388 
ACTINOPTEETGII. 
P. 2100. Pish of nearly similar size and proportions apparently of 
this species, but, if so, with dorsal and anal fins incom¬ 
plete behind; Sendenhorst. Egertm Coll. 
Sphenocephalus cataphractus^ W. von der March. 
1863. Sphenocephalus cataphractus, W. von der March, Palseontogr. 
vol. xi. p. 18, pi. iii. fig. 1, pi. vii. figs. 3-5. 
Type. Nearly complete fish ; Academy of Munster. 
A slightly smaller species than the type, with relatively larger 
head. Length of head with opercular apparatus considerably ex¬ 
ceeding the maximum depth of the trunh, 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 the fifth or sixth of these rays, also comprising 9 divided rays. 
Scales of lateral line about twice as deep as broad, two or three 
times as deep as those immediately below them. 
Form. Log. Upper Cretaceous : Westphalia. 
35039, P. 3824. Characteristic specimen, in counterpart; Senden¬ 
horst. Purchased, 1860, EnnisTciUen Coll. 
P. 2100 a. Fine specimen, displayins: ornamented head and scales 
in impression ; Sendenhorst. Egerton Coll. 
P. 3824 a. Imperfect fish, deepened by distortion ; Sendenhorst. 
Ennishillen Coll. 
Genus ACROGASTER, Agassiz. 
[Poiss. Foss. vol. iv. 1838, p. 5.] 
Syn. Acanthophoria, D. G. Kramberger, Djela Jugoslav. Akad. vol. xvj. 
1895, p. 45. 
Trunk much deepened and laterally compressed. Cleft of mouth 
large and oblique, and jaws with very minute teeth ; preoperculum 
with a few stout spines round the posterior border of its lower 
portion. Vertebrae about 12 in the abdominal, 14 in the caudal 
region. Pelvic fins arising below the origin of the pectorals, with 
one stout spine and 6 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 less ex¬ 
tended, with 3 or 4 small stout spines and 9 to 11 well-spaced, 
stout, divided rays ; caudal fin deeply cleft. Scales thin, apparently 
cycloid, none thickened or enlarged along the dorsal or ventral 
borders. 
