Cope.] '»t) [August 15, 



margin of the centrum which is cut out below it for the intercentrum. 

 The sacrum is rather robust. Its two vertebrae are not coossified, and 

 support well developed neural spines, and a large free diapophysis for the 

 ilium. The centra of the caudals, and their diapophyses and neural 

 spines are well developed. There is a fossa at the base of the spine on 

 each side, in line with the zygapophysial surfaces, equidistant between 

 them. 



The fragment of ilium is of appropriate size, and is quite robust. It 

 displays the fossa for the sacral diapophysis, and the acetabulum. The 

 latter is remarkable for the prominence of the tuberosity on the superior 

 border, which exceeds that of any species of Pelycosaurian known to me. 

 The section of the ilium through it is triangular. 



The dentary bone is accompanied by the splenial to the middle of the 

 symphysis. The latter is not very long. Its dentary portion turns up- 

 wards. The ramus is quite robust, differing much from that of the 0. 

 leptocepJialus. It is broken off a little anterior to the tooth line, but the 

 latter probably did not contain more than twenty-two teeth. These have 

 anterior and posterior cutting edges, and are denticulate. The external face 

 of the dentary is excavated by shallow, undulating, branching grooves. 



Measurements. M. 



Total length of vertebrae preserved 640 



f anteroposterior 031 



Diameters centrum of a _j vertical behind diapophysis. . .019 



dorsal vertebra ,i fntpnd noi 



L transverse ^ ^^ ^°" ^~^ 



tat middle 0115 



Diameters neural arch / length with zygapophyses 041 



of same vertebra •- width at prezygajiophyses 023 



Diameters neural spine /anteroposterior 0145 



of same vertebra. . . . *- transverse behind 007 



Diameter of intercen- f anteroposterior 00.53 



trum of do \ transverse 023 



r anteroposterior 034 



transverse at end 036 



Diameters of a lumbar centrum-! " " middle.. .023 



I vertical behind arch. . .023 



[ " at end 029 



Length of sacrum 055 



r anteroposterior . . . .024 



Diameters of third caudal vertebra J vertical at end 033 



[ transverse at end.. .022 



Anteroposterior diameter ot acetabulum 0325 



Transverse diameter of ilium at tuberosity 0265 



Length of dentary bone supporting twenty teeth 044 



Thickness at twentieth tooth 0175 



Depth ramus at second tooth 035 



" '* fifteenth tooth 039 



