422 
ACTINOPIEEYGir. 
1863, Platycormus oblongus, W. von der Marck, loc. cit. vol. xi. p. 21, 
pi. i. 7, [Nearly complete fish ; Academy of Miinster.l 
1868. Platycormus ohlongus, W. von der Marck, loc. cit. vol. xv. p. 273. 
1885. Platycormus gemnanus, W. von der Marck, loc. cit. vol. xxxi. 
p. 244. 
Type. Nearly complete fish; Bonn University Museum and 
British Museum. 
The type species, attaining a length of about 0'25. Length of 
head with opercular apparatus considerably exceeding half the 
maximum depth of the trunk, and the latter measure nearly 
equalling the length from the pectoral arch to the base of the caudal 
fill. Pelvic fins comprising a relatively short spine, one simple ray 
closely articulated distally, and four rays both articulated and 
divided distally; dorsal fin arising in advance of the anal but 
extending as far backwards as the latter to the base of the short 
caudal pedicle; dorsal fin with seven stout, sharply-ridged spines, 
the seventh about two thirds as long as the next ray, which is the 
longest, simple but closely articulated distally, and followed by from 
22 to 26 gradually shortening rays, both divided and articulated 
distally; anal fin much less elevated than the dorsal, with four 
similar spines, one simple articulated ray, and from 18 to 22 divided 
rays. Scales very finely and uniformly granulated and serrated. 
The difiPerences between the two forms distinguished by W. von 
der Marck seem to be due entirely to accidents in preservation. 
Form. ^ Loc. Upper Cretaceous: Westphalia. 
P. 506. Counterpart of type specimen in the Museum of the 
University of Bonn, described and figured by Agassiz, 
loc. cit.; labelled “ gewonnen auf’m Baumberg, 1819.” 
Egerton Coll. 
P. 3976. Fine fisb, chiefly in impression, apparently counterpart of 
the specimen figured by W. von der Marck, loc. cit. 1863, 
pi. i. fig. 1; Sendenhorst. The finely-ribbed spines in 
advance of the dorsal fin are especially well displayed; 
and there seems to be an impression of a short, delicate 
spine at the base of the foremost articulated but undivided 
ray of the pelvic fin. The fine granulations and serrations 
of the scales are distinctly shown in impression. 
Enniskillen Coll. 
P. 3976 a. Smaller impression, equally fine; Sendenhorst. The 
five soft rays of the pelvic fin are distinct, the foremost 
being only articulated distally, not divided. The squama- 
tion is also well shown. Enniskillen Coll. 
