1870.] 531 [Cope. 



rior face of the bone ; the last receives the basal articulation of the hsema- 

 pophyses. The centra are crushed, their measui-ements with those of 

 the jaws are as follows : 



M 



Length centrum 0.025 



Long diameter (crushed) 035 



Short " " 0175 



Depth maxillary bone anteriorly , , 031 



Depth dentary " " 015 



Length crown inferior tooth 006 



Number " " " in .01m 3 



" " superior *' " 4.5 



Length crown " " " 0046 



The vertebrae are about as large as those of a fully grown " drum fish," 

 Pogonias. 



From the yellow chftlk of the upper Cretaceous of Kansas, found on the 

 Solomon or Nepaholla River, Kansas, at a point 160 miles above its mouth, 

 by Professor B. F. Mudge, Professor of Natural Science in the State 

 Agricultural College of Kansas. 



I append a description of some caudal vertebrae of a species probably 

 different from the 8. pMebotomus. It is indicated by three consecutive 

 caudal vertebrae which resemble those of -S'. prognathus and S. tJiaumas, 

 but which difler also considerably from both ; the several arches and spines 

 are of very great width : in 8. ihaumas they are narrow, and in 8. prog- 

 natltus, as wide, but here their width exceeds the depth and equals the 

 length of the centrum. As in the other caudals, the lateral grooves are 

 wanting and the inferior pair remain separated by a lamina. The neural 

 suture is very distinct, and not two angled as in 8. prognathus, but with 

 ai median decurvature and rise anteriorly. The neural spines are twice 

 as wide as deep and lie on each other. The third vertebra is shorter than 

 the others and contracted distally ; it is probably the penultimate of the 

 series ; neural canal minute. Surface striate ridged. 



Measurements. , M. 



Length centrum anterior vertebra 0.021 



Depth " (at middle) anterior vertebra 015 



Width neural arch at base spine 010 



Depth spine 0072 



Length third vertebra 0135 



Width neural arch 014 



" " spine 0176 



From a point twenty miles east of Fort Wallace, Kansas. Professor 

 Mudge's collection. 



In this species the vertebras in question are longer in proportion to 

 their other dimensions than in those described, besides carrying wider 

 neural arches and sinnes. 



