PALiEOXISCIDiE. 
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. boc. 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, 
hut 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. 
Hot 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. Hat. 
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* - O 
Cheirolepis unilateralis , E. von Eichwald, tom. cit. (1844), p. 830, 
and tom. cit. (1846), pt. ii. p. 305, pi. x. figs. 26, 27, and 
tom. cit. (1860), p. 1574, pi. lvii. fig. 14.-—Ibid, and River 
Ischora. 
Microlepis exilis , E. von Eichwald, tom. cit. (1844), p. 830, and 
tom. cit. (1846), pt. ii. p. 303, pi. x. figs. 22, 23, and tom. cit. 
(1860), p. 1576, pi. lvii. fig. 12.—Devonian; Pdver Ischora. 
Microlepis lepida , E. von Eichwald, tom. cit. (1844), p. 830, and 
tom. cit. (1846), pt. ii. p. 302, pi. x. figs. 20, 21, and tom. cit. 
(1860), p. 1576, pi. lvii. fig. 13.—Devonian; Marjina. 
[The type species.] 
Genus NEMATOPTYCHIUS, Traquair. 
[Ann. Mag. Hat. 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 
