216 VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 



xv , , f anteroposterior ; 14 



Diameters, m 1 <. , L -. n 



j transverse ; 19 



tv , 9 f anteroposterior ; 14 



Diameters, m- z - < , r ± -n \ oo 



( transverse (internally) ; 22 



-p.. , of anteroposterior ; 12 



Diameters, m-^ < , l r , ' ,, >. 01 



' ( transverse (internally) ; 21 



tv , , ( anteroposterior; 10 



Diameters, up < , l -, ^ 



\ transverse; 1 / 



Diameters 



I anteroposterior ; 13 



" [ transverse ; 18.5 



No. 5 — Right maxilla and lower jaw. 



-p.. ., f anteroposterior ; 30 



Diameters, crown m- 3 - \ , L -. n 



I transverse ; 19 



Length of diastema; 48 



Length of four true molars (m^ to m^ 5 -) ■ 66 



t^. , (anteroposterior; 13.5 



Diameters, crown m 1 s , l on c 



( transverse ; 21.5 



Length of symphyseal keel, axial ; 26 



yv | anteroposterior; 29 



Diameters, m T < , l -, n r 



1 { transverse ; 16.5 



Length of diastema ; 38 



" of ms-2_-g-, inclusive; 57.5 



t^. , I anteroposterior; 16.5 



Diameters, m x < , L 00 



4 j transverse ; 2o 



In No. 4 the pyramidal processes of the palatine continues as a vertical lamina 

 from the last molar posteriorly, and presents downward a moderately thickened 

 convexity, which has a submarginal ridge on the inner side. The greater cornua 

 of the hyoid are preserved in place, but the body of the hyoid is gone. They con- 

 sist of two subcompressed rods with expanded extremities, much as Leid}- describes 

 in M. jeffersonii. 



An inferior canine-molar tooth which I regarded as indicating a peculiar 

 species, which I called M. spkeitodon, probably belongs to a young animal of M. 

 wheatleyi. The apex of the tooth is contracted and the diameters continue to the 

 base. Several such teeth occur in the present collection. Corresponding teeth of 

 M. tortulus have been also taken from the Port Kennedy deposit. 



This species was dedicated to the late Mr. Charles M. Wheatley, who took 

 great pains to preserve the specimens first discovered at Port Kennedy, and to 

 whom we owe nearly all the specimens of vertebrata from the trias of Pennsylvania 

 which we possess. 



Among the numerous separate molars are many last superior ones. These 

 display every transition between the triangular and oval forms already referred to. 



