Cope] ^-^t* [April 15, 



of the digit to which belonged the phalange previously described above. 

 It indicates powerful prehensile use of the feet. 



The Tanystrophaas longicollis was about the size of a greyhound. Its 

 neck was like that of a swan, and its tail was of considerable length. 



7. Tanystroph^us batjri Cope. Cailurus bauri Cope. American Nat- 

 uralist, 1887, p. 368. 

 Almost as much of this species is preserved as of the last. There are 

 no phalanges, but everything else is represented, including several cervical 

 vertebrae, none of which are complete. There is a probable head of a 

 tibia. 



The differences are seen in the peculiarities of the cervical vertebrae and 

 of the femur, and in the inferior size. The sides of the cervical centra are 

 deeply and widely grooved on the posterior half, and the superior face of 

 the neural arch is strongly grooved on each side on the anterior half. The 

 femur is not so strongly grooved at the third trochanteric ridge on its ex- 

 terior side, as in the T. longicollis. 



M. 

 vertical 010 



Diameters of anterior face of third cervical , . . . _ 



transverse 0115 



Width of do., including parapophyses 017 



Diameters of cervical centrum, behind \ ^ „ 



(transverse 013 



Length of dorsal vertebra 030 



_-. ^ , . . 1 (transverse 015 



Diameters do. posteriorly i . , ^^ . 



^ •' [vertical 014 



Length of sacrum 073 



^. „ . , . . o A vertical . . . .014 



Diameters of anterior sacral centrum, in front 



pubis j 



transverse. .015 



^. ^ ^ 1, 1 <• T- , anteroposterior 032 



Diameters of head of pubis \ ^ ... 



transverse 010 



„. ^ , 1 o • T_. (anteroposterior ? .023 



Diameters head of ischium < '■ „^ „ 



•- transverse 013 



_. ^ T^, 1. ,. (anteroposterior 020 



Diameters distal end ischium \ ^ . . „ 



(. transverse 013 



Transverse diameter of femoral condyles 022 



-r.. ^ , 1 « ..,. (anteroposterior 024 



Diameters head of tibia -^ ^ ^,„ 



( transverse 018 



The head of the tibia is trilobate posteriorly. The outline is anteropos- 

 teriorly sigmoid, the spine turning outwards and forming an acute angle. 

 From this apex both borders are strongly sigmoid, the external com- 

 mencing with concavity, the internal with convexity. The distal end of 

 the ischium is oblique to the long axis of the bone, and its outline is tri- 

 angular ; the external convexity being stronger than in the T. longicollis. 



The sacrum consists of four rather elongate centra, which have a sub- 

 quadrate vertical section. A portion of an ilium adheres to it in the speci- 



