54 



Thickness of the short cranial crest separating the temporal fossaj postc 



riorly : { inch 



Breadth of temporal fossae from the occipital bonier to the end of the post- 

 orbital process !) inches. 



Vertical extent in advance of zygomatic root 5 inches. 



Breadth of cranium outside of zygomata 11 inches. 



Height of occiput Scinches. 



Breadth of occiput at post-tympanic processes i>.\ inches. 



Breadth of cranium at ends of post-glenoid processes 8 inches. 



Transverse diameter of occipital foramen 23 lines. 



Vertical diameter of occipital foramen, estimated 10 lines. 



Breadth at occipital condyles together 47 lines. 



Depth of occipital condyles 18 lines. 



Breadth of occipital condyles 10 lines. 



Width of basi-occipital at anterior condyloid foramina IS lines. 



Width of basi-occipital at conjunction with basi- sphenoid 15 lines. 



Distance between glenoid articular surfaces i>l lines. 



An upper-jaw fragment, from the same individual as the cranium just 

 described, contains the last two molars, of which the penultimate one is rep- 

 resented in Fig. 3, Plate XXIV. This tooth closely resembles the corre- 

 sponding one of the same species represented in Fig. 10, Plate XXIII, and 

 also that of Palcnosyops paiudosus as represented in Figs. 3 to 5, Plate IV, and 

 Fig. 9, Plate V. The last molar, as far as it is preserved, likewise resembles 

 the corresponding tooth represented in the same plates. The inner part of 

 the crown presents a single conical lobe. 



The infra-orbital border forms a thick, obtusely rounded ledge projecting 

 obliquely forward on the face. In Palaosyops paiudosus the corresponding 

 ridge presents an acute anterior edge defining it from the facial surface beneath. 

 The outer part of the thick infra-orbital ridge rises in a short, blunt, conical emi- 

 nence or postorbital process. The orbital floor is concavely depressed within 

 the prominent margin, and forms a long, triangular platform terminating 

 behind in the thick posterior boundary of the maxilla. 



The measurements of the specimen are as follows : 



Lines. 



Space occupied by the last two molars 32 



Breadth of second molar 20 



Width of second molar 20 



Height of anterior orbital margin from the molars 20 



Fragments of both sides of the lower jaw with all the teeth broken away, 

 except portions of the last molars, also accompany the preceding specimens. 

 The best preserved, fragment partially restored from the corresponding por- 

 tion of the opposite side is represented in Fig. 4, Plate XXIV. It agrees in 



