110 HWAY—VERTEBRATES OF CARBONIFEROUS AGE. [March 16, 
are continued backward, growing smaller to near the posterior bor- 
der. It seems to me that Newberry and Worthen’s Figures 13 and 
14 present the characteristics of the scales of this species in a pretty 
satisfactory manner; although in Figure 13 the areolation is not 
small enough. Prof. Cope’s figure of the species represents the 
concentric lines of growth near the posterior border entirely too 
conspicuous ; although in his description he says that they are 
rarely present. 
Prof. Cope has stated that one of the nodules in his hands con- 
tained two scales in mutual relation. A careful examination shows 
that there are three such scales present. I have before me a scale 
50 mm. long taken from a modern Cerafodus, which in form and 
the general arrangement of the nutrient canals is strikingly like the 
large scale of S. guincunciatus above described. However, I 
find that in the living Ceratodus the canals do not give off so many 
branches, and that consequently the enclosed area or cells are much 
larger than in Sagenodus. 
SAGENODUS TEXTILIS Hay. 
Sagenodus gurtetanus Cope, Proc. AMER. PHILOS. Soc., xxxvi, p. 
82, Pl. i, Fig. 9 (preoccupied by Cope, 1877) ; Williston, S. 
W., Kansas Univ. Quart., viii, 1899, p. 177. 
Sagenodus textilis, Hay, O. P., Amer. Naturalist, xxxiii, 1899, p. 
786. 
This, on careful examination of the type specimen, I regard as a 
very distinct species, and it is well represented in Cope’s figure 
cited above. Undera lens no radiating striz are seen anywhere. 
A trace of lines of growth is present at one of the angles, and from 
these I infer that the proximal extremity of the scale is that nar- 
rowed border which in Prof. Cope’s figure is directed upward and 
toward the eft hand. No other specimens are known. 
RHIZODOPSIS MAZONIUS sp. Nov. 
This species is based on a single scale which bears the U. S. 
National Museum Catalogue, No. 4337. It belongs to the Lacoe 
collection and was obtained at Mazon creek, Ills. It was in 
Prof. Cope’s hands and bears his numbers F, 65, F, 66, the nodule 
being split as usual into two portions. Prof. Cope has labeled the 
specimen ‘‘Ce/acanthus sp. Cope,’’ but it does not belong to this 
genus and probably not to the family of Ccelacanthide. The 
