1900.] HAY—VERTEBRATES OF CARBONIFEROUS AGE. 107 
reticulatus has convinced me that they belong to the same species 
of fish. A comparison of Prof. Cope’s figures of the two alleged 
species will show that they do not differ greatly in form or in 
sculpture. S. veticudatus as figured has its free extremity consider- 
ably narrowed, but another scale identified by Prof. Cope as S. 
recticulatus (U.S. Nat. Mus. No. 4389 = Cope’s F, 58) has this ex- 
tremity narrowed as little as it isin S. magzster. The scales as- 
signed to the latter name are indeed much larger, but the scales 
of a young fish are naturally smaller than those of an old 
and larger one. The system of canals in both lots of scales 
covers the greater part of the surface with a fine meshwork. Only 
a patch near the upper border and another near the lower border 
have the areolation coarser. The coarseness of the areolation on 
the upper border of Prof. Cope’s Figure 2 is exaggerated, those 
large cells being subdivided by finer canals which are not figured. 
This species must not be confounded with that recorded as Sage- 
nodus reticulatus Newberry by Mr. A. S. Woodward in his Cafa- 
logue of Fossil Fishes, Part ii, p. 26, and which was originally de- 
scribed as Crenodus reticulatus.‘ The reference of both Crenodus 
reticulatus and Rhizodus reticulatus to Sagenodus makes it neces- 
sary that the later described species, C. retécu/atus, shall receive a 
new name. It may be called Sagenodus jugosus, in allusion to the 
seven radiating ridges on the crown of the tooth on which the 
species was based. 
SAGENODUS FOLIATUS Cope. 
Sagenodus foliatus Cope, E. D., PRoc. AMER. PHILOs. Soc., xxvi, 
1S07),, Deapie bl. tj. bigs 1; Williston, (5: W.,. Kansas. Ong: 
Quart., vili, 1899, p. 177. 
The form and the character of the meshwork of nutrient canals 
are shown in Prof. Cope’s figure cited above. ‘That figure, how- 
ever, presents too conspicuously the system of concentric lines. 
The strize which Prof. Cope describes are not indicated in the fig- 
ure, and indeed could hardly be represented on account of their 
fineness. ‘These striz may, with a good lens, be seen to occupy a 
considerable portion of the surface of the scale. A feature of the 
network of nutrient canals is that one set of these radiate from the 
centre to all parts of the border of the scale. ‘They lie close to- 
gether and are frequently connected by cross canals, so that rows 
1 Geological Survey of Ohio, ii, 1875, p. 60. 
