4 
ACTIXOPTERYGII. 
Genus DICTYOPYGE, Egerton. 
[Quart. Journ. Geol. Soc. vol. iii. 1847, p. 276.] 
A group of species differing only from Catopterus in the more 
forward position of the dorsal fin, which never arises behind the 
origin of the anal fin. 
Dictyopyge macrura (Redfield). 
1841. Catopterus macrurus , W. C. Redfield, Amer. Journ. Sci. vol. xli. 
p. 27. ijjttt 
1847. Dictyopyge macrura , Six—Er-EgPffoh, Quart. Journ. Geol. Soc. 
vol. iii. p. 276, pi. viii., pi. ix. fig. 1. 
1857. Catopterus macrurus, W. C. Redfield, Proc. Amer. Assoc. Adv. 
Sci. 1856, pt. ii. p. 186. 
1888. Dictyopyge macrura, J. S. Newberry, Fos$. Fishes Trias. N. 
Jersey and Connecticut (Mon. U.S. Geol. Surv. no. xiv.), p. 64, 
pi. xviii. figs. 1, 2. 
Type. Nearly complete fish/ 4^*4/—-U- - a , 
The type species, attaining a length of about 015. Length of 
head with opercular apparatus somewhat less than the maximum 
depth of the trunk, and equalling less than one-fifth of the total 
length of the fish ; depth of caudal pedicle less than half that of 
the abdominal region. Cranial bones externally ornamented with 
fine granulations. Pelvic fins arising midway between the pectoral 
arch and the anal fin; dorsal fin at least as deep as long, arising 
slightly in advance of the anal and scarcely smaller than the latter, 
which comprises about 30 rays and extends almost to the base of 
the caudal fin. Scales smooth, not serrated. 
Form. Sf Loc. Triassic: Richmond Coalfield, Virginia, U.S.A. 
Not represented in the Collection. 
Dictyopyge socialis (Berger). 
1843. Semionotus socialis, H. A. C. Berger, Neues Jahrb. p. 86. 
1864. Dictyopyge socialis, J. Striiver, Zeitschr. deutsch. geol. Ges. 
vol. xvi. p. 322, pi. xiii. fig. 2. 
Type. Nearly complete fish ; University Geological Museum, 
Gottingen. 
A large species, attaining a length of about 0*2. Length of head 
with opercular apparatus about equal to the maximum depth of the 
trunk and contained five times in the total length of the fish ; 
depth of caudal pedicle slightly less than half that of the abdominal 
region. Cranial bones with an external rugose ornament. Pelvic 
fins arising about midway between the pectoral arch and the anal 
