﻿HOLOPTYCHIID^). 



325 



Holoptychius giganteus, Agassiz. 



1839. Holoptychius, R. I. Murchison, Silur. Syst. p. 600, pi. ii. bis. 



fig. 3. 

 1845. Holoptychius giganteus, L. Agassiz, Poiss. Foss. V. G. R. pp. 73, 



140, pi. xxiv. figs. 3-10. 

 1848. Holoptychius princeps, F. M'Coy, Ann. Mag. Nat. Hist. [2] 



vol. ii. p. 310. [Scale ; Woodwardian Museum, Cambridge.] 



1854. Holoptychius giganteus, R. I. Murchison, Siluria, pi. xxxvi. 

 fig. 11. 



1855. Holoptychius giganteus, F. M'Coy, Brit. Palaeoz. Foss. p. 594. 

 1855. Holoptychius princeps, F. M'Coy, ibid. p. 595. 



1888. Holoptychius giganteus, M. Lohest, Ann. Soc. Geol. Belg. 



vol. xv. p. 146, pi. vi. figs. 2, 3, pi. vii. figs. 5, 6. 

 (?)1889. Holoptychius giganteus ?, J. S. Newberry, Palaeoz. Fishes 



N. America, p. 101, pi. xix. figs. 15, 16. 

 1890. Holoptychius giganteus, Woodward & Sherborn, Cat. Brit. Foss. 



Vertebrata, p. 96. 



Type. Detached scales. 



A species of very large size, known only by detached scales. 

 Scales of abdominal region externally ornamented with close, thick, 

 irregularly tortuous, longitudinal ridges, often branching and 

 interrupted, more or less replaced posteriorly by rounded tubercles ; 

 caudal scales resembling those of H. nobilissimus. 



The variety of scale named H. princeps by M'Coy is very rare, 

 and may be regarded as exhibiting merely an extreme modification 

 of the ornament just described. 



The teeth of this species are probably described as Dendrodus 

 biporcatus (p. 338). 



Form. Sf Loc. Upper Old Red Sandstone : Elgin and Nairn. 

 Upper Devonian : Belgium and N.W. Russia. (?) Catskill Group : 

 Pennsylvania. 



28869. Small (? caudal) scale ; Scat Craig, near Elgin. 



Purchased, 1854. 



35992-93. About ten imperfect scales ; Scat Craig. 



Purchased, 1861. 



P. 702. Six scales ; Scat Craig. Egerton Coll. 



P. 5094. Five imperfect scales ; Scat Craig. 



Presented by John Edward Lee, Esq., 1885. 



28868. Impressions of seven scales, one small example ornamented 

 as " H. princeps " and traversed by a sensory canal ; 

 Alves, near Elgin. Purchased, 1854. 



