306 
ACTIN OPTERYG II • 
Genus HOPLOPTERYX, Agassiz. 
[Poiss. Foss. vol. iv. 1838, p. 4.] 
Trunk much deepened and laterally compressed. Frontal region 
of skull deeply ridged for mucus-cavities ; cleft of mouth little 
oblique, and jaws with very miuute teeth ; orbit small or of modi 
rate size ; preoperculum without spine, only serrated. 1 ertebric 
about 10 in the abdominal, 14 in the caudal region. Pelvic h ,is 
arising below or somewhat behind the origin of the pectorals, 
with one stout spine and 7 or 8 divided rays. Dorsal fin 11111 c 1 
extended, its anterior half consisting of 5 to 9 stout spines, not 
closely pressed together ; anal fin comparatively short, with 3 to •> 
stout spines, not closely pressed together; caudal fin more or lc sS 
deeply cleft. Seales ctenoid, rather large, rarely ornamented w it i 
granulations, and none much enlarged or thickened ; lateral Inn 
forming a conspicuous discontinuous ridge. 
Hoplopteryx antiquus, Agassiz. 
A 
1838-39. Hoplopteryx antiques, L. Agassiz, Poiss. Foss. vol. iv. PP- ’ 
131, pi. xvii. figs. 6-8. , 
1868. Hoploptei-yx antiquue, W. von der Marck, Zeitschr. deutse 
geol. Ges. vol. x. p. 252. 
1863. Hoplopteryx anliquus, var. minor , W. von der Marck, Palseontogr- 
vol. xi. p. 13, pi. i. fig. 4 . f 
1863. Hoplopteryx antiquus, var. major, W. vo<n der Marck, loc. ci 
vol. xi. p. 14, pi. ii. fig. 1. 
1885. Hoplopteryx mitiquus, W. von der Marck, loc. cit. vol. xxXI ' 
p. 243. 
Type. Nearly complete fish ; Palaeontological Museum, Munich. 
The type species, attaining a length of about 03, but usual v 
smaller. Length of head with opercular apparatus nearly equal to 
the maximum depth of the trunk, and contained about one and a 
half times in the length from tho pectoral arch to the base of th° 
caudal fin. Origin of pelvic fins opposite to that of the dorsa , 
which occupies ono half the length of the back (measured fr°® 
occiput to caudal fin), comprising 6 ribbed spines and 11 divide 1 
rays ; anal fin with 4 similar spines, gradually increasing in leng ■ *’ 
and 9 or 10 divided rays, terminating behind slightly beyond t 0 
dorsal. 
Form. S( Loc. Upper Cretaceous : Westphalia. 
There is no typical example of this species in the Collection, bu , 
as observed by W. von der Marck (loc. cit. 18851, the small f° rIU 
