THE SUBCLASS SYNAPSIDA 239 



Tapinocephalus Owen, Taurops Broom, Archaeosuchus Broom, 

 Scapanodon Broom, Eccasaurus Broom, South Africa. 



Family Deuterosauridae. Upper Permian. Deuterosaurus, 

 Eichwald, Ural Mts. 



Family Rhopalodontidae. Upper Permian. Rhopalodon, Eich- 

 wald, Ural Mts. 



Family TiTANOSUCHiDAE.i Upper Permian. Titanosiichus Owen , 

 South Africa. "Lamiasaurus" [snout]. 



B. Suborder dromasauria 



About the size of a rat. Skull short; orbits large; lacrimals con- 

 tinuous to septomaxilla ; temporal opening bounded by postorbital, 

 squamosal, and jugal; possibly the preparietal, and probably the in- 

 terparietal, present; parietal foramen large; teeth isodont,subisodont, 

 or absent; quadratojugals obsolete or absent; vertebrae notochordal, 

 intercentra unknown; two or three sacrals, probably twenty-eight 

 presacrals; parasternals present; no acromion and no cleithrum; 

 pelvis plate-like, pubic foramen large; carpus primitive, tarsus with 

 or without a fifth tarsale; phalangeal formula 2, 3, 3, 3, 3. 



Family Galechiridae. A single row of subisodont teeth. 

 Middle Permian. Galechirus Broom, Galesphyrus Broom, Galepus 

 Broom, South Africa. 



Family Galeopidae. Edentulous. 



Middle Permian. Galeops Broom, South Africa. 



Family Macroscelesauridae. Macroscelesaurus Haughton. 



C. Suborder Anomodontia 



From the size of a mouse to that of a tapir, vegetable or inver- 

 tebrate feeders. Large temporal opening bounded by postorbital, 

 squamosal, and jugal. Skull typically short and wide, the face short; 

 quadrates and squamosals large; lacrimals small; quadratojugals 

 small or obsolete.- Preparietal usually present, in front of, or sur- 



^ [A number of new genera of South African Titanosuchidae were described by Broom 

 in 1923 (Proc. Zool. ^oc, London). — Ed.] 

 2 [See page 243, below. — Ed.] 



