181 



"d.io.. 



Text-fig. 4. Skull of Kotlassia, slightly distorted, occipital view, camera 

 drawing. 



Text-pig. 5. Same specimen, otic region, latero-posterior view, slightly en- 

 larged (scale showing centimeters), camera drawing. 



Text-fig. 6. Same specimen, brain case, free-hand drawing. 



B. o., basioccipital; d. so., dermosupraoccipital; e. o., exoccipital; /. ov., 



fenestra ovalis; /. t. p., post-temporal foramen;/, q., quadrate foramen; /. X, 



vagus foramen; par. oc, paroccipital; pas., parasphenoid; pro., prootic; pt., 



pterygoid; q., quadrate; spheth., sphenethmoid; sq., squamosal; St., stapes; 



tab., tabular. 



