120 PROCEEDINGS OT THE PALEOXTOLOGICAL SOCIETY 



As at present known, the invertebrate fauna of the Caney shale consists of 

 about 50 species and varieties, besides a considerable number of indeterminate, 

 and the relationships of this fauna are held by Dr. Girty to warrant a corre- 

 lation with recognized faunas of Upper Mississippian age. The character of 

 the fish remains tends to support this conclusion, as far as the evidence g - 

 though it is admittedly slight, and is in conflict with that furnished by the 

 plant remains, which latter favor a correlation with the Pottsville. The ques- 

 tion of the age of the Caney shale is discussed by Dr. Girty in Bulletins 377 

 and 439 of the D. S. Geological Survey, to which reference should be made for 

 full details. 



If UTATIOXS OF WAAGEN AXD OF DE TRIES 

 BY H. F. OSBOBX 



COMPARISOX OF THE LATE PLEISTOCEXE FAVXA OF EUROPE AXD XORTH 



AMERICA 



BY H. F. OSBOBX 



SIGXIFICAXCE OF INDICES AXD RATIOS IX THE PHYLOOEXETIC AXD 

 SYSTEMATIC STUDY OF MAMMALS 



BY H. F. OSBOBX 



XEW PLESIOSAURIAX GENUS FROM THE NIOBRARA CRETACEOUS OF 



XE BR ASK A 



BY S. W. WILLISTOX AXD BOY L. MOODIE 



i Abstract ) 



The new genus is a member of the widely distributed family, the Elasmo- 

 saurida?. and is based on a complete series of cervical vertebrae with limbs 

 and girdle elements. The distinguishing characters of the new genus are the 

 short, uniform centra of the cervical vertebrae from Cloud County. Kansas. 

 The characters of the limbs show the animal to have been a young but nearly 

 mature individual. There are no evidences for the formation of the articular 

 surfaces of the ends of the propodials for articulation with the mesopodial 

 elements. The cervical centra have on the ventral surface throughout a pair 

 of vascular foramina, and the surfaces of all the skeletal elements show evi- 

 dences of the presence of a richly vascular periosteum. There are 51 cervical 

 vertebrae preserved with a total length of nearly two meters. The individual 

 vertebra? increase in length and breadth according to the following measure- 

 ments : 



3d cervical vertebra? 20 mm. long. 30 mm. wide 

 Gth 



12th 



20th 

 •th 



40th 



45th 



51st 



23 - 



■• 32 



30 " 



•• 38 



34 - 



u M 



41 " 



- 52 



45 i( 



; - 67 



45 ' ; 



- 07 



46 " 



- 72 



