1900.] HAY—VERTEBRATES OF CARBONIFEROUS AGE. 109 
lacovianus, so far as sculpture and form are concerned; but the 
size is but little less than that of the type of S. dacovianus. 
SAGENODUS QUINCUNCIATUS Cope. 
Lhizodus reticulatus, part, Newberry and Worthen, Geolog. Surv. 
Milinois, iv, 1870, p. 349, Pl. iii, Figs. 13, 14; Woodward, 
A. 9.5 Cat. Foss. Fishes, Pt. 11; 1891, p. 262 (referred with 
doubt to Sagenodus). 
Sagenodus guincunciatus Cope, E. D., Proc. AMER. PHiLos. Soc. 
RKEVI, 1697, p. 80, Pl. i, Fig. 65 Williston, S. W., Kensas 
_ Om. Quart., viii, 1899, p. 177. 
This species has for its type the scale bearing U. S. Nat. Mus. 
Cat. No. 4364 = (Cope’s F, 39, 40). It must have been a very 
abundant species in the region of Mazon creek, since besides the 
five specimens recorded in Prof. Cope’s paper, there are in the por- 
tion of the Daniels’ collection in my hands five additional scales. 
Four of these resemble so closely those described by Prof. Cope 
that no mistake can be made in their identification. One of these 
(Daniels’ No. ro) is considerably larger than any of those seen by 
Prof. Cope, having a length of 31 mm. The other specimens in 
my hands are Daniels’ Nos. 11, 20, 21, and U. S. Nat. Mus. Cat. 
No. 4366, the latter being a part of the Lacoe collection. 
As before stated, Prof. Cope referred to this species the speci- 
mens described and figured by Newberry and Worthen in vol. iv 
of the Geological Survey of Lilinois, p. 349, Figs. 13, 14. Of the 
correctness of the identification of Figure 14 there can be no doubt. 
As to Figure 13, Prof. Cope himself was in doubt, mainly because it 
represented a scale much larger than any other of the species in his 
hands. The scale before me which bears U. S. Nat. Mus. Cat. 
No. 4366, broken away slightly at the proximal end, has been 
nearly as long as the one represented by Newberry and Worthen’s 
Figure 13, but is narrower, the length being 63 mm., the width 38 
mm. ‘The distal border is more convex than that of the figure. It 
has all the characteristics of the smaller specimens of S. gu¢ncunct- 
atus, and it becomes more certain that the one figured by New- 
berry and Worthen belongs here. In this species the nutrient 
canals stream backward toward the posterior border, constantly 
anastomosing with one another, and in the middle region of the 
scale forming an irregular and fine areolation. Above and below 
the growth-centre there are a few very large cells, and similar cells 
