Mr. D. M. S. Watson on the Cynodontia. 521 



Fiff. 12. 



5«. RT.ff 



Qu. Q«.J. 



Frotacmon brachyrhinus, gen. et sp. n. Occiput of the type-skull, X §. 



Fi- 13. 



5*. VPTf VCLY W VS.C 



Protacmon brachyrhinus. The type-specimen, with the block con- 

 taining the upper part of the right squamosal removed, viewed 

 obliquely from above and the right. The course of the veins in 

 the temporal fossa, so far as it is clearly recognizable from the 

 groove on the bones, is indicated in black. 



E.Pt., epipterygoid ; Ju., jugal; Orb., right orbit; Sq., squamosal; 

 V.C.L., vena capitis lateralis ; V.S.C., the vein of the "sinus 

 canal"; V.P.T.F., the vein which passes through the post- 

 temporal fossa ; V. 2 + 3 , the foramen through which the maxillary 

 and mandibular branches of the trigeminus leave the skull. 



