336 
CROSSOPTERYGII. 
part; Lethen 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 Enniskillen Colls. 
Holoptychms (Glyptolepis) quebecensis, Whiteaves. 
1881. Glyptolepis microlepidotus, J. F. Whiteaves {non Agassiz), Cana¬ 
dian Nat. n. s. vol. x. p. 32. 
1889. Glyptolepis quebecensis, J. F. W T hiteaves, Trans. Boy. Soc. 
Canada, vol. vi. sect. iv. p. 77, pi. v. fig. 4. 
1890. Glyptolepis quebecensis , B. H. Traquair, Geol. Mag. [31 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 bv Whiteaves, in the much smaller size of the 
pectoral fin and the greater attenuation of the caudal lobe. 
Form. Sf Loc. Upper Devonian : Scaumenac Bay, P. Q., Canada. 
Not represented in the Collection. 
Holoptychms (Glyptolepis) paucidens (Agassiz). 
1844. Platygnathus paucidens , L. Agassiz, Poiss. Foss. V. G. B. 
pp. 61, 78, pi. xxviii. fig. 11. 
1849. “ Scales, Under Jaw,Beptile Tooth, and Ischium of Asterolepis” 
H. Miller, Footprints of the Creator, p. 71, figs. 25, 26, 30-33, 42. 
1888. Glyptolepis paucidens , B. H. Traquair, Geol. Mag. [3] vol. v. p. 513. 
1890. Glyptolepis paucidens , B. H. Traquair, Ann. Mag. Nat. Hist. [6] 
vol. vi. p. 483. 
Type. Bight 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 continuer) 
upon the overlapped portion of the scale by short, radiating lines of 
tubercles. 
Form . $ Loc. Lower Old Bed Sandstone: Orkney and Caithness. 
