﻿326 CR0SS0PTERYG11. 



38720. Impression of medium-sized scale ; near Nairn. 



Purchased, 1804. 



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. Hall (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, Palaeoz. 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, Palaeoz. Fishes N. America 

 (Mon. U.S. Geol. Surv. no. xvi.), p."ll4, 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 tuber culations. 



Form. 6f Loc. Catskill Group (Upper Devonian) : Delhi, New 

 York State. 



Not represented in the Collection. 



