mXOPNTTHTTliE. 287 



21739 a. The slightly imperfect secoud dorsal vertebra. 



31749. The imperfect second dorsal vertebra. 



21745 a. A smaller second dorsal vertebra. Apparently associated 

 with No. 21745. 



21738. Three specimens of the third dorsal vertebra, wanting the 

 neural spine. There is a large anterior and a smaller 

 posterior pneumatic foramen. 



21738 a. A somewhat imperfect third dorsal, differing slightly from 

 the preceding specimens. 



21748. Two nearly similar imperfect third dorsals. 



21724. The fourth dorsal vertebra, wanting the neural spine. The 

 marked anterior haemal process found in the skeleton of 

 j1. parva is absent. 



21749 a. The entire fifth dorsal vertebra. The neural spine is 

 relatively lower than in A. i:>avva, and in place of the 

 three large lateral pneumatic foramina of that species 

 there is but one anterior foramen. 



33068 a. A slightly smaller fifth dorsal vertebra, wanting the 

 greater portion of both transverse processes. 



Walter Mantell Gollection. 



32066 a. A nearly similar fifth dorsal vertebra, wanting the ex- 

 tremity of the right transverse process. 



Walter Mantell Collection, 



21739 b. An imperfect fifth dorsal vertebra. There is no distinct 

 posterior pneumatic foramen. 



21724 a. The fifth dorsal vertebra, wanting the neural spine. 



32068. The sixth dorsal vertebra. The tliree pneumatic foramina 

 of A. parva are noticeable. Walter Mantell Collection. 



21725. Two specimens of the sixth dorsal vertebra, wanting the 

 neural spine. 



21725 a. The sixth dorsal vertebra, with the neural spine and 



transverse processes broken away. There are three pneu- 

 matic foramina. 



21725 b. The seventh dorsal \ertebru, wanting the neural spino. 



