CLEPSYDROPID^. 



109 



The length of the larger centrum is 0,025, and the dia- 

 meter of its terminal face 0,020. The capitular facets are 

 well shown on the posterior border of the haemal surface of 

 the intercentrum. Purchased, 1885. 



Embolophorus dolloverianus, Cope 1 . 

 The vertebrae are still larger than those of the preceding form. 

 Hab. North America (Texas). 



R. 569. Two imperfect dorsal vertebrae and an intercentrum, appa- 

 (Pig.) rently associated ; from the reputed Permian of Texas. 

 These specimens (fig. 25) agree closely with the types de- 

 scribed and figured by Cope, of half the natural size, in 

 the ' Proc. Amer. Phil. Soc' vol. xxii. p. 43, pi. i. fig. 4 

 (1884), without specific name. One specimen exhibits, the 

 centrum and a part of the neural arch, with the zygapo- 

 physes. The intercentra are of large size and exhibit 

 the facet for the ribs on the posterior border of the haemal 

 surface. Purchased, 1885. 



Pig. 25. 



Embolojjhurus dollovtrianus.— Posterior (a) and left lateral (b) aspects of an 

 imperfect dorsal vertebra, and lateral (c) and inferior (d) aspects of an inter- 

 centrum ; from the reputed Permian of Texas, f . pt.c, postzygapophysis ; 

 tp, broken transverse process ; r, capitular facet of intercentrum. 



1 Trans. Amer. Phil. Soc. vol. svi. p. 287 (1886). 



