THE UPPER TRIASSIC OF WESTERN TEXAS. 



25 



As the figures are reduced to the same scale, it is necessary to take the measure- 

 ments into account to realize the difference in size. The measurements are given in 

 the following table: 



From the shape of the interclavicles it is believed by the author that only one 

 specimen, No. 3814, can be placed in the genus Metoposaurus; it has been described as 

 M . jonesi. 1 All but one of the others correspond in a general way, and as they were found 

 in the same region as the perfect skull of Buettneria and a second, imperfect skull of the 

 same genus, they may be regarded, provisionally, as belonging to that genus. Specimen 

 No. 7364 is decidedly different in form, proportions, and sculpture and may be distinct; 

 the imperfect state of preservation renders this somewhat doubtful. 



The clavicles are not well preserved, except in the specimen No. 3814, but the 

 general form and sculpture do not differ markedly in the portions preserved. In 

 specimen No. 7367 the clavicles are long in correlation with the long anterior process 

 which the interclavicle must have possessed. 



Few other bones of Stegocephalia were found. A single humerus of small size 

 and with poorly ossified articular ends was found associated with the small interclavicle, 

 No. 7368, and probably belonged to the same individual. Numerous vertebral centra 

 of typically stereospondylus form were found scattered in the beds. One with a double 

 articular face is undoubtedly the anterior one of the series. No neural spines or other 

 parts of the skeleton were found. 



1 Case, E. C, Occasional Papers of the Museum of Zoology, University of Michigan, No. 82, 1920. 



