Cope.] 520 [April 5) 



the absence of lateral and inferior edges, and the narrow reflected portion 

 of the anterior border for the capitular facet. The diapophyses are short, 

 and the tubercular surfaces not much extended. The zygapophysial sur- 

 faces are but moderately oblique. The sides of the centrum are gently and 

 uniformly concave, and the inferior middle line is obtuse and not promi- 

 nent. 



The centra of the smaller specimens alluded to, are a little depressed, 

 and may pertain to another part of the column. 



Measurements. M. 



C anteroposterior 021 



Diameters of centrum -j transverse 022 



(^ vertical . 021 



Expanse of anterior zygapophyses 019 



Width of neural canal 009 



Theropleura triangtjlata. 

 The centra of the vertebra? of three and probably four individuals repre- 

 sent this reptile. The superior part of these resembles that of the T. uni- 

 formis in lacking the angle posterior to the diapophysis seen in the T. ret- 

 roversa, and in the small extent of the capitular rib-facet. The inferior 

 part of the centrum differs in the presence of three longitudinal rib like 

 angles, separated by two latero-inferior shallowly concave faces. The 

 median rib is not very prominent, is obtuse, and concave in profile. The 

 articular faces are relatively rather wider than in the vertebrse described as 

 typical of the two species preceding ; but in one vertebra (No. 2) the pro- 

 portions are nearly the same. 



In the second vertebra mentioned the neural arch is entirely preserved. 

 The diapophysis is at its base, and of small size ; the vertebra is from not 

 behind the median dorsal region. The neural spine is compressed and 

 elevated, and with narrow, truncate apex. The articular faces of the zyg- 

 apophyses are nearly horizontal. 



Measurements. M. 



( antero-posterior 018 



Diameters centrum No. 1 ■< transverse 017 



(vertical. 016 



S antero-posterior 023 

 transverse 024 

 vertical 026 



Expanse of anterior zygapophyses 020 



Elevation of neural spine above zygapophyses. 052 



„. A „, ^ .f fore and aft 016 



Diameter of do. at summit < A ___, 



(. transverse 007 



Batrachia. 



Eryops megacephalxjs Cope. Proceed. Amer. Philos. Soc, 1877, p. 188. 



To the characters which I have ascribed to the genus Eryops as above 



cited, I now add the following. A series of a few large teeth much exceed- 



