176 



MR. D. M. S. WATSON ON 



Order Dicynodontia. 



Anomodonts with a reduced quadrate ' and quadratojugal. 

 T-shaped squamosal without otic groove. Fenestra ovale carried 

 down by a long process composed of basioccipital, basisphenoid, 

 prootic, and paroccipital. 



Scapula with acromion. 



Glenoid cavity borne only on scapula and coracoid. Pelvis 

 with a pubo-ischiac vacuity. 



Dicynodon Owen. M. and U. Permian, S. Africa and Russia. 



Tropidostoma Seeley. U. ,, ,, 



Endothiodon Owen. M. Permian, S. Africa. 



Cryplocynodon Seeley. U. Permian, ,, 



Prodicynodon Broom. ,, ,, 



Pristerodon Huxley. ,, ,, 



Gordonia Newton. ,, Scotland. 



Geikia ,, ,, ,, 



Kisticephalus Owen. ,, S. Africa. 



Dicelurodon Broom. ,, ,, 



Taognathus ,, ,, 



Kannemeyeria Seeley. M. Trias, ,, 



Lystrosaurus Cope. L. Trias, ,, 



Eubrachiosanrus Williston. M. Trias, Wyoming. 



Placerias Lucas. M. Trias, Arizona. 



Order Theriodontia Owen. 



Anomodonts with carnivorous specialisation and reduced 

 quadrate and quadrato-jugal. Glenoid cavity on scapula and 

 coracoid. 



Sub-Order Gougonopsia Lycld. 



Therioclonts with the parietal excluded from the temporal 

 fossa. Palate with no suborbital vacuities. 



Gorgonops Owen. M. Permian, S. Africa. 



Scymnognathus Broom. U. 



Arctops Watson. M. 



Galesuchus Haughton. M. 



Scymnosaurus Broom. M. 



? Cynodraco Owen. M. ? 



? Tigrisuchus Owen. U. ? 



jElurosaurus Owen. M. 



Arctognathus Broom. U. 



Inostransevia Amalitzki. U. „ Russia. 



11 55 



55 55 



It ?J 



?5 )) 



Sub-Order Gynodontja Owen. 



Theriodonts with a narrow intertemporal bar formed by the 

 parietals. Secondary palate with no suborbital vacuities. 



