106 HAY—VERTEBRATES OF CARBONIFEROUS AGE. [March 16, 
guadratus, but as having an entirely exceptional form, is undoubt- 
edly rightly identified. Its sculpture is in all respects like that of 
the specimen that I have above somewhat minutely described, ex- 
cept that the centre of growth is filled up with a very fine mesh- 
work of canals. In this respect it resembles the broadly oval scale 
above mentioned. The scaie now being considered has a depth of 
38 mm. and a length of only 24 mm. _ It bears the U. S. National 
Museum’s Cat. No. 4388. 
SAGENODUS RETICULATUS (Newb. and Worth.). 
Rhizodus reticulatus Newberry and Worthen, Geol. Sur. Ji1., 
1870, iv, p. 349, Pl. iii, Fig.9 (not Figs. 13, 14); Wood- 
ward, A. S., Cat. Foss. Fishes, Pt. ii, 1891, p. 262 (referred 
with doubt to Sagenodus). 
Sagenodus reticulatus Cope, Proc. AMER. PHILos. Soc., xxxvi, 
1897, p. 78, Pl. i, Figs. 2, 3; Williston, S. W., Kansas Univ. 
Quart., viii, 1899, p. 177- 
Sagenodus magister Cope, Proc. AMER. PHILOS. SOC., xxxvi, 
1897, p. 81, Pl. i, Fig. 8; Williston, S. W., Kansas Univ. 
Quart., viii, 1899, p. 177. 
In the report of the Geological Survey of Illinois, vol. iv, as 
above cited, Newberry and Worthen described the species AAzzo- 
dus reticulatus and illustrated it by three figures (Pl. iii, Figs. 9, 
13,14). Prof. Cope, writing in 1897, as cited, concludes that two 
distinct species were involved in the original description and 
figures and, judging from the materials before me, I believe that he 
was correct. Prof. Cope then, as he had an undoubted right to do, 
restricted Newberry and Worthen’s specific name to their Figure 9 
and referred the other Figures 13, 14 to his own new species S. 
quincunciatus. It is unfortunate that the figure of the type is such 
an unsatisfactory one. Prof. Cope’s figure of S. recticulatus shows 
auite well its characters. He states that the longitudinal striz of 
the distal border are not interrupted by any concentric lines, but 
the latter are nevertheless present in the specimen that he has fig- 
ured. The agreement of these scales in form with that figured by 
Newberry and Worthen (Fig. 9) makes it reasonably certain that 
they all belong to the same species. 
A careful study of Prof. Cope’s types of his S. #agister and com- 
parison of them with the scales which he has identified with 5S. 
