NO. 1449. 



THE OSTEOLOGY OF SINOPA— MATTHEW. 



21B 



groups are frequently present false bullae formed by processes of the 

 alisphenoid, partially replacing the true tympanic bullte. No sign of 



Fig. 5.— sinopa grangeri, inferior view of skull, nat. size. a. c, alisphenoid canal; a. c.f., 



SUPPOSED anterior CONDYLOID FORAMEN; aS, ALISPHENOID (THE DOTTED LINE IS NOT CARRIED 

 FAR ENOUGH); 60, BASIOCCIPITAL; 6s., BASISPHENOID; C, CANINE; C. /., CONDYLOID FORAMEN; /. ^. p., 

 FORAMEN LACERUM POSTERIUS; ./". O., FORAMEN OVALE; j 1, i> , 3, INCISORS; i. O. f., INFRA-ORBITAL 

 FORAMEN; JU, JUGAL; m 1, 2, 3, TRUE MOLARS; ?«p, MASTOID PROCESS OF THE PERIOTIC; mx, MAXILLA: 



OS, orbitosphenoid; p 1, 2, 3, i, premolars; ikiI, palatine; par. p., paroccipital process of the 



EXOCCIPITAL BONE; pet, BETEOSAL PROMINENCE OF THE PERIOTIC BONE; p. (J. /., POSTGLENOID 

 foramen; pmx, PREMAXILLA; sq, SQUAMOSAL. 



these processes is seen in Sinopa., and there is little or nothing in this 

 important region of the skull to indicate either marsupial or insec- 



