﻿PALiEONISCID^E. 



457 



Cheirolepis canadensis, Whiteaves. 



1881. Cheirolepis canadensis, J. F. Whiteaves, Canadian Naturalist, 



n. s., vol. x. p. 33. 

 1889. Cheirolepis canadensis, J. F. Whiteaves, Trans. Roy. Soc. Canada, 



vol. vi. sect. iv. p. 90, pi. viii. 



Type. Imperfect fish ; Geological Survey of Canada, Ottawa. 



A larger species than the type, closely similar in proportions, 

 but differing in the more advanced position of the pelvic fins and 

 the more remote situation of the dorsal. Scales and joints of fin- 

 rays pectinated. 



Form. Sf Log. Upper Devonian : Scaumenac Bay, P. Q., Canada. 



Not represented in the Collection. 



Some of the scales described as follows may also pertain to fishes 

 allied to the preceding, but they must be regarded as indetermin- 

 able : — 



Cheirolepis splendens, E. von Eichwald, Bull. Soc. Imp. Nat. 



Moscou, vol. xvii. (1844), p. 830, and ibid. vol. xix. (1846), 



pt. ii. p. 304, pi. x. figs. 24, 25, and Leth. Rossica, vol. i. 



(1860), p. 1573, pi. lvii. fig. 23.— Devonian ; Marjina, near 



Pawlowsk. 

 Cheirolepis unilateralis, E. von Eichwald, torn. cit. (1 844), p. 830, 



and torn. cit. (1846), pt. ii. p. 305, pi. x. figs. 26, 27, and 



torn. cit. (1860), p. 1574, pi. lvii. fig. 14.— Ibid, and River 



Ischora. 

 Microlepis exilis, E. von Eichwald, torn. cit. (1844), p. 830, and 



torn. cit. (1846), pt. ii. p. 303, pi. x. figs. 22, 23, and torn. cit. 



(1860), p. 1576, pi. lvii. fig. 12. — Devonian ; River Ischora. 

 Microlepis lepida, E. von Eichwald, torn. cit. (1844), p. 830, and 



torn. cit. (1846), pt. ii. p. 302, pi. x. figs. 20, 21, and torn. cit. 



(1860), p. 1576, pi. lvii. fig. 13.— Devonian ; Marjina. 



[The type species.] 



Genus NEMATOPTYCHIUS, Traquair. 



[Ann. Mag. Nat. Hist. [4] vol. xv. 1875, p. 259.] 



Trunk elongated. Mandibular suspensorium very oblique ; den- 

 tition in each jaw consisting of an inner sparse row of stout, conical, 

 laniary teeth, and an outer close series of small conical teeth ; ex- 

 ternal bones striated and tuberculated. Paired fins of moderate 

 size, median fins large ; fin-rays stout, distally birfurcating, closely 

 articulated, except in the proximal two-thirds of those forming the 



