46 PROCEEDINGvS OF THE NATIONAL MUSEUM vol.69 



Third caudal. — It (pi. 10, fig. 4) is complete with the exception of the 

 distal end of the neural spine and the extremities of the metapophy- 

 ses. The centrum is similar in proportions to the first and second 

 lumbars, but is shorter. The neural canal is not over 10 mm. in height 

 posteriorly. The posterior margin of the neural spine does not quite 

 overhang the base of the neural arch. The minimum anteroposterior 

 diameter (17.9 mm.) of the left transverse process is about two-thirds 

 the diameter (29.8 mm.) at the extremity. The posteroexternal angles 

 of the transverse processes (pi. 11, fig. 5) are very prominent. The 

 tip of the left and most of the right metapophyses are destroyed ; their 

 superior margins were not over 28 mm. above the top of the centrum. 



Fourth caudal. — Of this caudal (pi. 10, fig. 5) the anterior epiphysis 

 alone is preserved. The major portion of this ephiphysis is hidden 

 by the matrix. It measures 3.4 mm. in thickness. Most of the 

 ridges for attachment to the centrum radiate from the center. 



Sixth caudal. — With the exception of the anterior epiphysis, all 

 parts of this vertebra (pi. 12, fig. 1) are present. Judging from the 

 length of the centrum and other peculiarities, this seems to be the 

 sixth in the series. The posterior facets for the chevrons are placed 

 obliquely on the posterior faces of the large descending processes^ 

 while the anterior facets are narrower and barely discernible. The 

 left transverse process is strongly constricted at the base, measuring 

 16.8 mm. in width, the extremity is expanded, and the distance be- 

 tween the canal at the base and the anteroexternal angle is 28.4 mm. 

 The metapophyses are large processes which have a lateral carina 

 and they project forward beyond the level of the anterior epiphysis ; 

 their superior margins are at least 25.5 mm. above the top of the 

 contnim. The neural arches are relatively broad in comparison to- 

 the length of the centrum and are inclined forward. The neural 

 spine is wider than the neural arch, short in proportion to the size 

 of the centrum, but longer than the transverse process, and with the 

 extremity squarely truncated. The neural arches are complete and 

 the neural canal measures 9.5 mm. in height posteriorly. 



Seventh caudal. — The centrum (pi. 12, fig. 2) is shorter than that 

 of the preceding caudal and the posterior facets for the chevrons are 

 l)orne on longer and narrower descending processes; the anterior 

 facets are more carinate, the transverse processes are shorter, the 

 neural spine is considerably shorter and more noticeably constricted 

 near the base. The anteroposterior diameter (15.5 mm.) of the left 

 transverse process at the narrowest point is about one-fifth less than 

 at the extremity (19.8 mm.) ; the distance from the canal at the base 

 to the anteroexternal angle is 21 mm. The neural arches are com- 

 plete, with a minimum anteroposterior diameter of 16.5 mm., and the 

 height of the neural canal posteriorly is 8 mm. The minimum 



