308 Mr. D. M. S. Watson on 



All these features are t'ouud '\n Cot}4osaurs, many of them 

 also inTemnospoudylous Stejjocephalia, and, taken together, 

 render it certain that the Therapsid group was derived from 

 a Cotylosaurian reptile. 



When comparing together the remains of Texas reptiles 

 in Munich, I uas very much impressed by the many resem- 

 blauces (some only of a very superficial character) between 

 Varanosaiirus and the Captorhinidie. These may be listed 

 as follows : — 



1. The triangular skull, with a much narrowed preorbital- 



region. 



2. The deflected premaxillary dentigerous border, so that 



the incisor teeth are inclined backwards. 



3. Tlie identical arrangement of the bones of the face. 



Compare especially the lachrymal reaching the septo- 

 maxilla in each. The long, straight, antero-posteriorly 

 directed sutures between the prefrontal and lachrymal 

 and the frontal. The entrance of the latter bone into 

 the orbital margin for a very short distance, &c. 



4. The fact that the squamosal is the important bone in 



the temporal region, the rudimentary snpratempcnal 

 in Captorhinus occupying an exactly similar position 

 to that of Vuranosaurus. 



5. The apparently identical relations of the quadrate to 



the s([uamosal. 

 C>. The e])i[)terygoids arc similar in the two types. 



7. The articulation of the end of the parocci])ital process 



with the squamosal. 



8. The vertical position of the postparietals = interparietal. 



9. The heavy stapes articulating with a fenestra ovale 



placed so low down that tiie lower edge is in contact 

 Avith the basisphcnoid, only just above and behind the 

 tubcra basisphenoidales. 



10. The absolute identity of the basisphcnoid in the two 



types. 



11. The i)resence of a long strong; parasphcnoid in both. 



[Shcnvn very clearly in a Munich ^[iccinica oi Labido- 

 saurus-l 



12. The heavy and slightly swollen neural arches and 



horizontally ])lacc(l articulating facets of I'aranusaiints 

 recall those of Labidosuuras more than any other 



type. 



1.^. The rcKicmblance, ahaost amounting to identity, between 

 the cartilagiiions shonldci-girdlcs. [1 only know 

 Ldb'iilusuurus in not \vv\ wcll-i)res(rv(il material.] 



