110 ANOMODONTIA. 



R. 571. The imperfect centrum and base of the neural arch of a 

 dorsal vertebra ; from Texas. Purchased, 1885. 



R. 576. The centrum and base of the neural arch of a dorsal 

 vertebra ; from Texas. Purchased, 1885. 



Genericallt Undetermined Specimens. 



It is probable that a large proportion of the following specimens 

 are referable to various genera of the present family, but in the 

 absence of figures of so many of the typical forms it is impossible 

 to refer them to their proper position. 



All the following specimens were obtained from the reputed 

 Permian of Texas, and were purchased in 1885. 



R. 576 C. An imperfect right quadrate. This specimen approxi- 

 mates, both in size and contour, to the corresponding 

 bone of the skull of Naosaurus claviger figured by Cope 

 in the ' Trans. Amer. Phil. Soc' vol. xvi. pi. ii. fig. 1, 

 although it does not appear to belong to that species. 

 The squamous articular surface for the pterygoid is seen 

 on the lower part of the inner surface. 



R. 566. An imperfect cervical (?) vertebra, wanting the greater 

 portion of the neural spine. The terminal faces of the 

 centrum are deeply cupped ; the arch, which is distinct 

 from the centrum, has no transverse process, showing that 

 the ribs articulated solely with the centrum. 



R. 566 a. The centrum of a vertebra probably referable to the 

 same form as the preceding. There is a prominent capit- 

 ular rib-facet on the anterior border. 



R. 568. An imperfect caudal (?) vertebra. The terminal faces are 

 but slightly cupped, and there is a large double-headed 

 rib anchylosed to the sides of the centrum, as in the 

 caudals of Dimetrodon. 



R. 573. An imperfect dorsal vertebra of a large form. The trans- 

 verse process is large and prominent, and the terminal 

 faces of the centrum are nearly flat. 



R. 576 d. Part of the neural arch of a dorsal vertebra, showing the 

 entire transverse process. 



