Distal diameter of femur j foreaDclaft - 

 (transverse.. 



Cope.] ^4:0 [DeCi 21) 



The articular extremity is marked with irregular pits as in Dystropliceus and 

 (Jetiosaurus. 



Measurements. M. 



/•fore and aft.. . .150 



Diameter of anterior caudal vertebra. -? vertical 200 



'transverse 260 



Elevation to zygapophyses of the same 250 



Total elevation of the same 480 



Length of femur 1.400 



Proximal diameter of femur j fore and aft 165 



i transverse 410 



360 



450 



Diameter of middle of shaft of femur 280 



The caudal vertebrse of this species are much more deeply biconcave 

 than those of the Oamarasaurus supremus ; they also differ in their rela- 

 tively and absolutely greater breadth of centrum. 



TICHOSTEUS Cope. 

 Paleontological Bulletin No. 26, p. 194, (Published November 21st, 1877.) 



TlCHOSTEUS LTJCASANUS Cope. 



Loc. cit. 



SYMPHYROPHUS Cope. 



Vertebral centra moderately elongate, slightly amphiccelous, and com- 

 posed of uniformly and moderately dense osseous tissue. A narrow deep 

 fossa in the floor of the neural canal. Neural arch coosified to centrum, 

 with a lateral shallow fossa at its base. Neither costal articulation nor pro- 

 cess on the centrum. 



The coosification of the neural arch of this genus distinguishes it from 

 the few amphiccelous crocodilian genera known from North America, and 

 the fossa at its base' is so shallow as to separate it from sauria of the 

 Pneumatarthrus and Ornitlwpsis type. 



Symphyrophus musculosus Cope. 

 A vertebra of this species is strongly concave laterally and distinctly so 

 inferiorly. The anterior articular facets plane, the posterior slightly con- 

 cave. The superficial layer of bone is dense and smooth, excepting near 

 the edges of the articular surfaces, where it is rugose. The rugosity is 

 arranged in a line within the articular faces, and consists of numerous 

 small irregular pits and grooves which inosculate. Near the border the 

 grooves assume a transverse direction. There is a nutritive foramen near 

 the middle of each side of the centrum. There are traces of the neura- 

 pophysial suture, -.showing that the neural arch is distinct in young animals. 



Measurements M. 



antero-posterior 032 



Diameter of cent: ~l vertical 027 



transverse 031 



