Text-pig. 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. 0., basioccipital ; d. so.y dermosupraoccipital; e. o., exoccipital; /. oy., 



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



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



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



tab., tabular. 



