2 E. C. CASE 



The type genus and species, Embolophorus fritillus, was 

 described in 1878' as follows: 



This form reposes on some dorsal vertebrae with intercentra and ribs in 

 place, which display some interesting characters. The neural arch is co-ossi- 

 fied, and the zygapophyses and diapophyses are well developed ; the latter 

 not elongate, and standing on the base of the neural arch. The centra are 

 notochordal. The intercentra are narrowed and transversely elongate. The 

 ribs are two-headed ; the capitulum is received into a fossa on the posterior 

 border of the intercentrum in advance of the vertebra which supports the 

 diapophysis, to which the tuberculum is attached. 



The curious mode of articulation I have not observed in the species of 

 the genera heretofore described, unless the forms of some of the intercentra 

 of Clepsydrops limbatus indicate it. If so, that species must be removed to 

 Eniboloph rus. 



Char. spef. — Centra with circular section at all points and contracted in 

 at the middle. No carinoe or grooves. The intercentra project beyond the 

 edges of the centra, giving the column the appearance of supporting annular 

 ridges. Their lateral angles extend upward nearly to the base of the neural 

 arch. The diapophyses are short and directed upward and forward ; their 

 extremities are concave. The zygapophyses are large and their faces are 

 nearly hortizontal. The size of this species is small, little exceeding that of 

 Bolosaurus striattis. 



MEASUREMENTS. 



Length of a centrum with an intercentrum attached - - 0,0056"" 



Length of a centrum ---__.. 0.0040 



T->- . f ^ \ vertical - . . . . 0.0035 



Diameter of a centrum, •< , . , 



( horizontal .... 0.0035 



Expanse of diapohyses . . . . . ^ . 0.0080 



Expanse of heads of rib ...... 0.0035 



Elevation to summit of neural canal - - . . . 0.0045 



Later, in 1884,^ Cope described other features of Embolophorus : 



'I he articulation of the ribs i7i Embolophorus. — The ribs of the Thero- 

 morpha are two-headed. While the tubercular articulation has the usual 

 position at the extremity of the diapophysis, the capitular is not distinctly, or 

 is but partially indicated, on the anterior edge of the centrum, in Cleps)'drops 

 and Dimetrodon. In Embolophorus, as I showed in i86g [misprint for 1878], 

 the capitular articulation is distinctly to the intercentrum. A second and 

 larger species of that genus, recently come to hand, displays this character in 



'"Description of Extinct Batrachia and Reptilia from the Permian Formation of 

 Texas," Proc. Am. Phil. Soc, Vol. XVII, pp. 518, 519. 



*" Fifth Contribution to the Knowledge of the Fauna of the Permian Formation 

 of Texas and the Indian Territory," ibid.. Vol. XXII, p. 43. 



