2 
ACTIXOPTERYGII. 
and anal fins triangular, the origin of the former behind that of the 
latter ; caudal fin forked. Scales large or of moderate size, nearly 
or quite smooth ; dorsal ridge-scales somewhat enlarged. 
A description of the known species of Catopterus is given by 
J. S. Newberry in his “Fossil Fishes and Fossil Plants of the 
Triassic Rocks of New Jersey and the Connecticut Valley ” (Monogr. 
U.S. Geol. Surv. no. xiv. 1888). 
Catopterus gracilis, J. H. Redfield. 
1837. Catopterus gracilis, J. H. Redfield, Ann. Lyceum Nat. Hist. New 
York, vol. iv. pp. 37-39 (P non pi. i.). 
1841. Catopterus gracilis , W. C. Redfield, Amer. Journ. Sci. vol. xli. 
p. 27. 
1888. Catopterus gracilis, J. S. Newberry, Foss. Fishes Trias. N. Jersey 
and Connecticut (Mon. U.S. Geol. Surv. no. xiv.), p. 55, pi. xvi. 
figs. 1-3. 
Tijpe. Nearly complete fishes; Yale College Museum, New Haven, 
Connecticut, U.S.A. 
The type species, attaining a length of about 0-25. 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 somewhat less than half that of the 
abdominal region. Cranial bones finely granulated. Pelvic fins 
arising about midway between the pectorals and the anal; dorsal 
and anal fins nearly equal in size and almost completely opposed. 
Scales smooth, none deeper than broad, those of the flank in the 
abdominal region very finely serrated. 
Some small fishes from Boonton, Middlefield, and Sunderland, 
named Catopterus parvulus (W. C. Redfield, Amer. Journ. Sci. 
vol. xli. 1841, p. 28, and J. S. Newberry, op. cit. 1888, p. 60, 
pi. xvi. figs. 4, 5) are probably to be regarded as the young of this 
species. 
Form, § Loc. Triassic : Connecticut, Massachusetts, and New 
Jersey. 
P. 7495. Greater portion of abdominal and caudal region, showing 
paired fins ; Boonton, New Jersey. Ward Coll. 
P, 1038. Imperfect hinder portion of the abdominal region, with 
the caudal region ; Middletown, Westfield, Connecticut. 
Egerton Coll. 
P.1039. More imperfect specimen of the same; Durham, Con¬ 
necticut. Egerton Coll. 
P. 3515 a. Imperfect caudal region ; Durham. Enniskillen Coll. 
