164 
ACTINOPTEEVGII. 
35tli vertebral centrum ; anal fin less elevated and with more 
delicate ra 3 ’s than the dorsal, arising nearly opposite the 50th 
vertebral centrum. 
The so-called E. tenuicaudns is still regarded as a distinct species 
by von der March in his latest list (Palaeontogr. vol. xxxi. 1885, 
p. 240), but the only differences observed seem to be due to accidents 
in distortion and preservation. 
Form. ^ Log. Upper Cretaceous ; Westphalia. 
P. 2111. Imperfect fish displaying some of the principal characters 
of the head and opercular apparatus, described and figured 
in Proc. Zool. Soc. 1897, p. 268, pi. xviii. fig. 1 ; Senden- 
horst. Egerton CoV. 
P. 2114. Imperfect specimen on slab with other fishes, described 
ihid. p. 271; Sendenhorst. Egerton Coll. 
P. 4481. Impression of fish wanting the end of the snout, described 
and figured ihid. p. 269, pi. xviii, fig. 2 ; Sendenhorst. 
EnnisTcillen Coll. 
P. 5949. Head and greater portion of trunk in counterpart, 
described and figured ihid. p. 270, pi. xviii. fig. 3 ; Sen¬ 
denhorst. The scales of the lateral line are especially 
conspicuous. Purchased, 1889. 
Another example of this species is preserved on a large slab 
numbered P. 9251. 
Genus EKTCHEIjURUS, W. von der March. 
[Palaeontogr. vol. xi. 1863, p. 58.] 
An imperfectly known genus provisionally placed in this family 
on account of the general resemblance of its skeleton to that of 
Echidnocephalus. Vertebrae very short and numerous, marked with 
delicate longitudinal striae ; neural arches in the abdominal region 
expanded into narrow laminae. Paired fins small, about equal in 
size; dorsal fin at least as deep as long, arising opposite to or 
behind the pelvic fins ; anal fin much extended ; a separate fringing 
caudal fin, pointed behind. Scales small, those of the lateral line 
apparently thickened but not enlarged. 
Enchelurus villosus, W. von der March. 
1863. Enchelurus villosus, W. von der March, Palaeontogr. vol. xi. 
p. 58, pi. ix, fig. 5. 
Tgpe. Imperfect distorted trunk; Academy of Miinster. 
