3 
tus. No foramina below, except supratympanic ; ee a supraglenoid 
and one or two postglenoids. 
Phascotaretos ; subsquamosal and postzygomatie only : ‘the latter com- 
municating with an empty chamber. ‘ 
Macropus and Hypsiprymnus ; postglenoid, postzygomatic, supratym- 
panic and postsquamosal ; the second communicating with a chamber filled 
with cancelli. 
Fig. 1—Skull of opossum (Didelphys virginiana) uatural size, posterior view, 
parts of the right mastoid and squiamosal bones removed. M, mastoid fora- 
‘nen; SBS, subsquamosal; PG, postglenoid; PZ, postzygomatic foramen, 
Didelphys ; postglenoid, postzygomatic, ee and mastoid ; 
postzy gomatic small. 
Dasyurus ; postglenoid, subsquamosal and probubly mastoid. I cannot 
find a postzy gomatic. 
Phalangista ; postsquamosal and postparictal ee no postzygomatic 
nor supratympanic. 
EDENTATA. 
Tamandua ; F. f. diploética anterior and posterior, and postsquamosal 
only. i 
Dasypus (6-cinctus); postelenoid (large), postsquamosal], mastoid, 
several postparietals, and a small subsquamosal. ; 
Chlamydophorus ; a postglenoid only. 
Manis ; postzygomatic only. : 
Megalonyx ; postsquamosal and supratympanic ; a closed fissure at posi- 
tion of postglenoid. A Jarge foramen below the usual position of mastoid. 
Bradypus and Cholepus ; no foramina. 
