326 
CR0SS0PTERYG11. 
38720. Impression of medium-sized scale; near Nairn. 
Purchased , 1864. 
P. 4732. Three imperfect scales, one being almost completely 
tuberculated, and another exhibiting only tortuous, 
branching, anastomosing ridges ; River Ssjass, Govt, of 
St. Petersburg. Purchased, 1884 
Holoptychius americanus, Leidy. 
1843. Holoptychus nobilissimus, J. Ilall (non Agassiz), Geol. New 
York, pt. iv. p. 281, woodc. fig. 130, no. 2. 
1856. Holoptychius americanus, J. Leidy, Journ. Acad. Nat. Sci. Philad. 
[2] vol. iii. p. 165, pi. xvi. figs. 9, 10, pi. xvii. figs. 1-3 ( non fig. 4). 
1889. Holoptychius americanus, J. S. Newberry, Pakeoz. Fishes N. 
America (Mon. U.S. Geol. Surv. no. xvi.), p. 113, pi. xix. 
figs. 12, 13. 
Type. Detached scales; Museum of the Academy of Natural 
Sciences, Philadelphia. 
A large species, known only by detached scales and fragments of 
head-bones. Scales of abdominal region externally ornamented 
with thick, irregularly tortuous, longitudinal ridges, more or less 
interrupted and branching. 
Form. <$f Loc. Catskill Group (Upper Devonian): Pennsylvania, 
U.S.A. 
P. 5084. Three fragments of rock with imperfect scales ; Blossburg. 
Presented by John Edward Lee, Esq., 1885. 
Holoptychius halli, Newberry. 
1889. Holoptychius hallii, J. S. Newberry, Pakeoz. Fishes N. America 
(Mon. U.S. Geol. Surv. no. xvi.), p. 114, pi. xx. fig. 10. 
Type. Imperfect trunk ; New York State Museum, Albany. 
Form and proportions of trunk as in the type species, but the fins 
apparently exhibiting a relatively greater breadth. Scales ex¬ 
ternally ornamented by broad, flattened, striated longitudinal ridges, 
more or less parallel, but sometimes radiating and anastomosing; 
no tuberculations. 
Form, Loc. Catskill Group (Upper Devonian): Delhi, New 
York State. 
Not represented in the Collection. 
