936 THE JOHN DAT FAUNA. 



zygomatic arches are robust and expaoded, and the sagittal crest is high. 

 The auditory bullae are inflated and thin-walled. The orbits look some- 

 what forwards and very little upwards. The superciliary region is slightly 

 prominent, and there is a prelachrymal concavity. The infraorbital foramen 

 is moderate, and is situated mostly above the posterior part of the fourth 

 premolar. The muzzle is flat above, and the nasal bones are wide, and are 

 not emarginate above the osseous nares, as in many recent Carnivora. Pos- 

 teriorly, the superior border of the brain-case descends, but the parietal 

 bones maintain a gently convex outline in their high sagittal crest. The 

 supraoccipital region is elevated, and projects posteriorly. The lateral 

 occipital crests are prominent to the base of the paroccipital process. The 

 latter projects strongly posteriorly, and is connected with the bulla by an 

 osseous mass which is continuous with the inner border of the process. It 

 is connected with the posttympanic b}' a longitudinal crest, which includes 

 a deep groove between it and the otic bulla. The posttympanic is a tuber- 

 osity which extends downwards below the middle of the meatus auditorius, 

 and is not in contact with the bulla. The postglenoid process has greater 

 transverse extent than in the recent species of Canis. There is no trace of 

 preglenoid crest. 



The basioccipital bone is elevated on the middle line, so as to include 

 a deep fossa on each side between it and the otic bullae. There is no trans- 

 verse ridge connecting this ridge with the paroccipital process, as in Canis, 

 Galecynus, and Temnocyon, but the fossa above mentioned is continuous with 

 the precondylar fossa. The basisphenoid is not keeled, and its lateral 

 borders rise on the otic bullae in a thin lamina on each side. The pterygoid 

 fossa is narrow for the size of the skull, but is appropriate to the attenua- 

 tion of the postorbital region. The posterior nareal border does not advance 

 in fi-ont of the posterior line of the last molar tooth, and is a double con- 

 cavity, the dividing angle being little prominent. The maxillary is not 

 notched on each side of the palatine on its posterior border, as in the Am- 

 phicyon hartsJiornianus. The palate is medially flat, but its sides descend to 

 the alveolar borders, rendering the whole convex upwards. The face is 

 concave behind the canine alveoli. The orbits are small, and the postor- 

 bital processes are obtuse angles. The postorbital process of the zygoma 



