60 
ACTLNOPTERYGII. 
1877. Ischypterus latus, R. H. Traquair, Quart. Journ. Geol. Soc. 
vol. xxxiii. p. 559. 
1888. Ischypterus tenuiceps, J. S. Newberry, Foss. Fishes Trias. N. 
Jersey and Connecticut (Mon. U.S. Geol. Surv. no. xiv.), p. 32, 
pi. v. figs. 1-3, pi. vii. fig. 3. 
1888. Ischypterus latus , J. S. Newberry, ibid. p. 46, pi. xiii. fig. 3. 
1889. Allolepidotus americanus, W. Deecke, Paleeontogr. vol. xxxy. 
p. 114. 
Type. Imperfect fish; Geological Society of London. 
A species attaining a length of about 0*2. Trunk with con¬ 
siderably arched dorsal border, the depth of the caudal pedicle more 
than one-third as great as the maximum depth of the abdominal 
region. Length of head with opercular apparatus less than the 
maximum depth of the trunk, and contained four times in the total 
length of the fish. Fins as in S. fultus. Scales smooth and not 
serrated, those of the middle of the flank in part twice as deep as 
broad; dorsal ridge-scales large and conspicuous, comparatively 
obtuse in large specimens. 
Form, df Log. Triassic: Massachusetts, Connecticut, and New 
Jersey. 
38548-49. Two small fishes, imperfectly preserved; Sunderland, 
Mass. Purchased , 1864. 
P. 3511 b. Specimen about 018 in length; Massachusetts. 
FnnisTcillen Coll. 
P. 1017-8. Four fragmentary specimens, displaying the deepened 
scales on the flank ; Sunderland, Mass. Egerton Coll. 
P. 7400. Fish 0*145 in length ; Connecticut. 
Presented by Prof. C. U. Shepard. 
38547. Two similar specimens ; Connecticut. Purchased , 1864. 
28429. Slab with two specimens ; Connecticut. Mantell Coll . 
26591. Middle portion of large fish ; Connecticut. 
Presented by Dr. J. J. Bigsby, 1851. 
P. 3512. A very large imperfect specimen, doubtfully of this species ; 
Boonton, New Jersey. Enniskillen Coll. 
Semionotus alsaticus, Deecke. 
1889. Semionotus alsaticus, W. Deecke, Palseontogr. vol. xxxv. p. 104, 
pi. vi. fig. 1. 
Type. Nearly complete fish; Strassburg Museum.* 
