200 PROCEEDINGS OP THE ACADEMY OP 



piece is cartilaginous, with the anterior fourth alone ossified. The trifling 

 differences in the scapula would probably vanish with age, as the less extent 

 of the superior and supero-anterior outline. Teeth acute, incurved. 



Length from end of muzzle to notch 9 in. 



" (straight) from end of muzzle to occ. condyle ;. 17 " 



" " " atlas to last dorsal 14-25 in. 



" " " " " caudal 40 in. 



" of anterior limb 9-75 in. 



" of scapula ! 6-5 " 



Height of " % 4-5 " 



Breadth of occiput between temporal crests 7 in. 



" muzzle at notch 4 " 



" " middle 2-75 in. 



Other characters are apparent in the following comparison : 



A. Palate without lateral grooves : teeth 53. 

 Premaxillaries forming an elevated, rounded ridge tursio. 



B. Palate do. : teeth 3442. 



a. Outline from foramen magnum to frontal crest 



nearly straight. 



Diameter of temporal fossa, made longer than preorbital 



process ; muzzle flat ; paroccipital most curved outward 



and developed ; width of muzzle at notch two and a half 



times in length clymene. 



aa. Outline from foramen to crest curved, cranium 

 rounded ; temporal fossa much longer than pre- 

 orbital process. 

 Occiput rounded, broad ; paroccipital well developed ; tri- 

 angle to tooth line. Muzzle shorter, 2J its width at 

 notch, flat at the end, premaxillaries" a high ridge me- 

 dially doris. 



Occiput rounded ; paroccipital ala strongly curved outwards ; 

 width of flat muzzle at notch two and a half times in 



length. Triangle short styx. 



Occiput elevated ; paroccipital ala very little developed ; 

 muzzle flat, narrow ; width at notch nearly three times 



in length; triangle long asthenops, var. 



Occiput broad, subtruncate, prominent behind the temporal 

 fossae ; width of muzzle at nqtch two and a half times or 

 less in length ; frontal regions broader otherwise as last, asthenops. 

 a.aa. Supraoccipital rounded in profile ; diameter of tem- 

 poral fossa shorter than preorbital process. 

 Muzzle very flat, 2 times breadth at notch ; a keel in front 



of nasal meatus crot aphis c us. 



C. Palate do. : teeth 4854. 



Muzzle ridged by the elevated premaxillary bones ; width at 

 the notch one-fourth the length ; triangle short ; occiput 

 rounded; teeth below 4951 mi crops. 



D. Palate with deep lateral grooves. 

 Teeth ^ | ; occiput rounded ; premaxillaries forming an ele- 

 vated angular ridge, subtrigonal in section ; paroccipital 



little developed. Smaller nasal meatus delphis? var. 



Teeth 37 42 ; occiput short, rounded ; breadth of muzzle to 

 length as 1 : 2 ; premaxillaries forming a rounded ridge. 



Larger nasal meatus delphis. 



The form of the fossa of the orbitospheuoid which is overhung by the plate 



[Oct. 



