188 
ACTINOPTERYGir. 
Genus PELARGORHYNCHUS, W. von der Marck. 
[Zeitsclir. deutscli. geol. Ges. vol. x. 1858, p. 242.] 
External bones slightly ornamented with short ridges and rows 
of tubercles. Teeth in form of small, slender, hollow cones, more 
or less clustered. Pelvic fins arising nearly midway between the 
pectorals and anal; dorsal fin occupying the greater part of the 
back; anal fin opposed to the hinder part of the dorsal; caudal 
fin forked. Two paired series of scutes on the fiank moderately 
enlarged, with a dense intermediate squamation of small rhomboidal 
scales. 
Pelargorhynchus dercetiformis, W. von der Marck. 
1858. Felargorhynchus dercetiformis, W. von der Marck, Zeitschr. 
deutsch. geol. Ges. vol. x. p. 248. 
1858. Pelargorhynchus blochiformis, W. von der Marck, ibid, p. 244. 
[Imperfect trunk: Academy of Miinster.] 
1863. Pelargorhynchus dercetiformis, W. von der Marck, Palseontogr. 
vol. XI. p. 61, pi. xi., pi. xii. fig. 3. 
1863. Pelargorhynchus bloehiiformis, W.von der Marck, loc. cit. vol. xi. 
p. 64, pi. xii. figs. 4-6. 
1885. Pelargorhynchus dercetiformis, W. von der Marck, loc. cit. 
voL xxxi. p. 261. 
Tyjpe. Imperfect distorted trunk ; Academy of Miinster. 
The type species, attaining a length of about 0'65. Length of 
head with opercular apparatus contained about five times in the total 
length to the base of the caudal fin. Pelvic fins with one articu¬ 
lated, six articulated and divided rays, arising slightly nearer to the 
anal than to the pectorals, considerably behind the origin of the 
dorsal; dorsal fin with 64 rays, the foremost the longest and much 
deeper than the trunk, arising about twice as far from the occiput 
as is its termination from the caudal fin ; anal fin with about 16 
rays, its hinder end opposite that of the dorsal. Lateral scutes 
elongate-heart-shaped, marked with radiating lines or rows of 
minute tubercles, and the upper series larger than the lower series ; 
intermediate squamation very finely granulated. 
Form, Loc. Upper Cretaceous : Westphalia. 
P. 2112. Imperfect trunk showing median fins and traces of the 
paired fins ; Sendenhorst. Egerton Coll. 
P. 1906. Eragment of trunk; Sendenhorst. Egerton Coll. 
As shown by a skull in the Kansas University Museum, Lawrence, 
the jaws described by Cope under the generic name of Stratodus 
