1877.] 1^7 [Cope. 



Another vertebra of nearly the same character, and one-half smaller size, 

 presents a greater difference between the long diameters of the upper and 

 lower sides. The superior diameter is only one-haff the inferior, and the 

 foramen chordae dorsalis much nearer the superior than the inferior mar- 

 gin. Its diameter is one-fourth the vertical and one-third the transverse 

 diameter. 



From the same locality and discoverer as the C. gibsonii. 



Lysorophus tricarinatus, Cope, gen. et sp. nov. 



Char, gen. Vertebrae amphiccelian, perforated by the foramen chordae 

 dorsalis. Neural arch freely articulated to the centrum. Floor of neural 

 canal deeply excavated. No processes nor costal articulations on the cen- . 

 trum, which is excavated by longitudinal fossae. Centrum not shortened. 



This genus resembles in the proportions of the centrum, the genus Clep- 

 sydrops, but differs in many details. 



Char, specif. Two centra and a portion of a third represent this species. 

 The former are a little longer than wide and a little depressed. The facet 

 for the neural arch is an elongate plane truncating the border of the fossa 

 of the neural canal on each side, for one-half to three-fifths the length of 

 the centrum. Two deep longitudinal fossae extend on each side of a 

 median rib of the inferior face ; and they are separated above by a narrower 

 rib from another longitudinal fossa which is below the base of the neural 

 arch. 



Measurements. M. 



( longitudinal 0055 



Diameter of centrum -1 vertical 0038 



(_ transverse 0040 



Length of facet for neurapcphysis 0035 



Width of neural canal , .0020 



Discovered by Wm. Gurley, near Danville, Illinois. 



DiPLOCAULus salamandroides, gen. et sp. nov. 



Char. gen. Vertebral centra elongate, contracted medially, and per- 

 forated by the foramen chordae dorsalis ; coossified with the neural arch, 

 and supporting transverse processes. Two rib articulations one below 

 the other, generally both at the extremities of processes, but the inferior 

 sometimes sessile. No neural spine nor diapophysis ; the zygapophyses 

 normal and well developed. 



The vertebrae of this genus much more nearly resemble those of a sala- 

 mander than any hitherto found in this formation, but it will be necessary 

 to observe the cranium before this point can be determined. 



Char., specif. One of Dr. Winslow's and two of Mr. Gurley 's 

 eendings contain vertebrae of this species. One from the latter gentleman 

 is contained in a mass of clay in immediate contact with a mandibular 

 ramus which supports a number of teeth. The ramus appears rather too 



