410 PEOF. T. JEFFEEY PAEKEE ON THE CEANIAL OSTEOLOGY, 



Deom^us. 



Occipital plane inclined backwards ; occipital condyle sessile ; occipital crest obscure. 



Length of cranial roof less than three times length of basis cranii. 



Width at paroccipital processes less than one and a half times length of basis cranii. 



Width at squamosals nearly twice length of basis cranii. 



Height of cranium about one and a half times length of basis cranii. 



Temporal fossa nearly vertical ; distance between temporal ridges equal to width of 



cranium at temporal fossse. 

 Zygomatic process strong and outstanding ; bears facet for quadrate on the inner 



surface of its distal end ; no squamosal prominence. 

 Width of orbit rather greater than width of cranium at paroccipital processes, and 



about one and a half times length of basis cranii ; interorbital septum present ; 



supraorbital ledge narrow, not notched in front, produced behind into a short 



postorbital process. 

 Lacrymal produced into a pointed, backwardly-directed orbital process, and a slender 



descending process, which is perforated for the lacrymal duct. 

 Antorbital well ossified and ankylosed laterad with the descending process of the 



lacrymal ; a deep Harderian fossa. 

 Maxillary process of nasal vestigial ; mesethmoid appears dorsally between posterior 



ends of nasals. 

 Premaxilla weak ; body flat, with a very short prenarial septum ; palatine processes 



long, width of body rather less than length of basis cranii. 

 Maxilla rather broad ; anterior end does not reach to body of premaxilla ; maxillo- 



palatine thin and pocket-like, containing a wide antrum. 

 Vomer nearly two and a half times length of basis cranii ; broad, flat, and longitu- 

 dinally grooved in front, narrow and deeply forked behind ; ankylosed to ptery- 

 goids. 

 Palatine a thin, oblique plate, somewhat longer than basis cranii, articulating in 



front with maxilla and behind with pterygoid. 

 Mandible weak ; symphysis flat with a narrow ventral ridge. 



Casuarius. 



Occipital plane inclined backwards ; occipital condyle sessile ; occipital crest 



obscure. 

 Cranial roof produced into a large crest ; nearly three times length of basis cranii. 

 Width at paroccipital processes nearly double length of basis cranii. 

 W idth at squamosals double length of basis cranii. 

 Height of cranium, not counting crest, nearly double length of basis cranii. 



