Cope.] 5 '8 [Feb. 3, 



forearm, or are a pair of short ribs. Impressions only of the teeth remain ; 

 they indicate small pleurodont denticles like those of the Anura. 



Measurements. M. 



Length of cranium above 029 



Width " " 037 



between epiotic angles 018 



' ' of interorbital space 007 



orbit 006 



Length " " 007 



skull to fontanelle 008 



from orbit to nares 005 



" " " to end of snout 003 



lateral pectoral shield 015 



atlas 004 



Width " " 004 



This species of Tuditanus differs from the T. radiatus in the larger and 

 less anteriorly placed orbits, and in the large truncate posterior table of the 

 skull. The proportions of the latter are more those of P. obtusus, but the 

 epiotic angles have not been observed in this species, the sculpture is punc- 

 tate not linear, and the form of the supraoccipital is quite different. Com- 

 parison with the other species referred to that genus is unnecessary, ex- 

 cepting in the case of the T. mordax. Further examination of the speci- 

 men on which the latter was founded leads to the belief that it is an imper- 

 fect cranium of Geraterpeton punctolineatum Cope. The latter name, as the 

 preferable one, may be adopted, and the former becomes a synonym. 



Colosteus scutellatus, Newberry; Cope, Rept. Geol. Surv. Ohio, 

 Paleontology Vol. II, p. 407. 



Another specimen of this species was obtained by Prof. Newberry during 

 the past season, which includes some parts of the skeleton not previously 

 observed. 



The specimen presents a superior view of the ventral and thoracic pro- 

 tective armature, and of the posterior portion of the cranium. As hereto- 

 fore, I find no indications of vertebrae, but along one side of the ventral 

 scutellation, a series of slender ribs lies in the matrix. These I have not 

 previously found in this genus. The cranial surface is only preserved on 

 the lateral portions. Its sculpture consists of coarse grooves closely placed, 

 directed outwards and forwards. 



