﻿336 CROSSOPTEETGII. 



part; Lethcn Bar. The fins are almost destroyed, but 

 the supporting elements of the second dorsal are distinct, 

 and are seen to consist of a single, club-shaped proximal 

 bone, with about six transversely-jointed bars forming a 

 distal series, as shown in the accompanying woodcut 

 (fig. 50). Purchased, 1878. 



P. 736, P. 3291. Small group of scales, in counterpart, labelled 

 Glyptolepis leptopterus by Agassiz ; Lethen Bar. 



Egerton Sf Ennishillen Colls. 



Holoptychius (Glyptolepis) quebecensis, Whiteaves. 



1881. Glyptolepis microlepidotus, J '. F. Whiteaves (wow Agassiz), Cana- 

 dian Nat. n. s. vol. x. p. 32. 



1889. Glyptolepis quebecensis, J. F. Whiteavee, Trans. -Roy. Soc. 

 Canada, vol. vi. sect. iv. p. 77, pi. v. fig. 4. 



1890. Glyptolepis quebecensis, R. H. Traquair, Geol. Mag. [3] vol. vii. 

 p. 16. 



Type. Nearly complete fish ; Geological Survey Museum, Ottawa. 



A species closely related to H. {Glyptolepis) leptopterus, but not 

 attaining so large a size, and differing, according to the original 

 description and figure by Whiteaves, in the much smaller size of the 

 pectoral fin and the greater attenuation of the caudal lobe. 



Form. <$f Loc. Upper Devonian : Scaumenac Bay, P. Q., Canada. 



Not represented in the Collection. 



Holoptychius (Glyptolepis) paucidens (Agassiz). 



1844. Flatygnathus paucidens, L. Agassiz, Poiss. Foss. V. G. R- 



pp. 61, 78, pi. xxviii. fig. 11. 

 1849. " Scales, Under Jaw, Reptile Tooth, and Ischium of Aster olepis,'' 



H. Miller, Footprints of the Creator, p. 71, figs. 25, '26, 30-33, 42. 

 1888. Glyptolepis paucidens, R. H. Traquair, Geol. Mag. [3] vol. v. p. 513. 

 1890. Glyptolepis paucidens, R. H. Traquair, Ann. Mag. Nat. Hist. [6] 



vol. vi. p. 483. 



Type. Right mandibular ramus ; British Museum. 



A species attaining a relatively large size. Head and opercular 

 apparatus occupying one-fifth of the total length. Pelvic fins 

 arising considerably behind the middle point of the fish. Scales 

 externally ornamented with well-spaced, delicate, irregular antero- 

 posterior ridges, often interrupted, sometimes bifurcating, and with 

 fine scattered wrinkles in the interspaces; the ridges continued 

 upon the overlapped portion of the scale by short, radiating lines of 

 tubercles. 



Form. Sf Loc. Lower Old Red Sandstone : Orkney and Caithness. 



