28 REVISION OF THE PELYCOSAURIA. 



Theropleura grandis sp. nov. 



Type : Twenty-two or twentj'-three disconnected vertebrse representing all parts 

 of the column. With the vertebrse are many fragments, among them an imperfect 

 ilium which probably belongs with them, as it is covered by the same kind of matrix. 

 Nos. 4130 and 4134 Am. Mus. Nat. Hist., Cope, coll.; from Texas. 



Description : In general the form is the same as Theropleura re/roi'ersa, but is 

 distinguished by its size, being nearly twice as large, and by the proportions of the 

 posterior vertebrae ; these are shorter when compared with the height and breadth 

 than vertebrae from the same region of the type species. The articular faces of the 

 centra are separated from the sides of the centra by a distinct ridge. 



Genus ELCABROSAURUS nov. 

 Elcabrosaurus baldwlni sp. nov. 

 Type : A series of disconnected vertebrse. No. 2285 Am. Mus. Nat. Hist., Cope, 

 coll.; from El Cabre, New Mexico. 



Description: This form is represented by a few imperfect vertebrse only, but the 

 characters of the posterior lumbars are totally different from those of any other 

 members of the Poliosaiiridce. The comparative table below best brings out the gen- 

 eric diiferences. 



(i) Character not shown. 



(2) Character not shown. 



(3) Character not shown. 



(4) Neural arch coossified with centrum. 



(5) Posterior lumbars ver>' much shortened and with wide facets on lower 



half of articular faces of centrum. 



(6) No wide intercentral face on anterior face of centrum. 



(7) Character not shown. 



(8) Spine of axis elevated and strong (top broken off). 



(9) Character not shown. 



(10) Character not shown. 



(11) Character not shown. 



(12) Character not shown. 



(13) Small, not exceeding i meter. 



This species has been given the name of Mr. Baldwin, the collector of 

 most of the material from New Mexico in the Cope collection. 



INCERTAE SEDIS. 



Archaeobelus velllcatus Cope (plate 4). 



"Species No. 4," Cope. Proc. Am. Phil. Soc, vol. xvii, 1877, p. 56. 



Archaoheliis velUcatus Cope. Proc. Am. Phil. Soc, vol. xvii, p. 192. Also Pal. Bull. 26. 



Type: A fragment of the right maxillary with the imperfect teeth in place. 

 Nos. 6524 and 6525 University of Chicago, Gurley, coll. ; from Vermilion county, 111. 



Original description of genus : "The form (of the teeth) is conical, and the 

 surface is not grooved nor furnished with prominent ridges. The interior is hollow, 

 and the walls are composed of a few concentric layers without external enamel or 



