South African Fossil Reptiles and Amphibia. 59 



outer half the postorbital is supported by the jugal, which also 

 extends along two-thirds of the inner side of the zygoma. 



The pineal foramen is situated some distance behind the post- 

 orbital arch. It is 6 mm. long, and its anterior border is formed by 

 the narrow, elongate preparietal. The parietal sends a process 

 forward between the frontal and preparietal to the level of the post- 

 orbital arch, and extends back for about half the length of the 

 temporal fossa. The postorbital forms almost the whole of the 

 upper border of the fossa. 



The squamosal is large, and has a large boss on its expanded 

 portion. It extends back for some considerable distance behind the 

 occipital plate, which slopes well forward in its upper half. 



The interparietal comes well on the top of the skull and is greatly 

 developed laterally. The quadrato-jugal is large, and the quadrate 

 well displayed. 



The lower jaw has a very deep mentum, the lowest point coming 

 a little behind the plane of the caniniform process, i.e. just below the 

 front of the orbit. 



The following are the chief measurements of the skull : 



Greatest length 150 mm. 



Maximum width 112 ,, 



Maximum width of parietal region 24 , , 



Maximum width of frontal region 19 ,, 



Maximum width of nasal overhang 29 ,, 



Minimum width across pterygoids 15 , , 



Length of pineal foramen 6 , , 



Width of pineal foramen 3 



Distance of pineal foramen behind postorbital 



bar 10 ,, 



Basal length 126 ,, 



Width between inside of caniniform processes... 24 ,, 



Maximum depth of lower jaw 33 ,, 



I have much pleasure in naming this species after Mr. J. A. Musto, 

 the former owner of Dunedin, from which place so many interesting 

 and varied types have been obtained. 



Type. Female skull. (S.A.M. Cat. No. 2674.) 



DlCYNODON BREVICEPS, Sp. n. 



This new species is founded upon a somewhat imperfect and 

 weathered skull and lower jaw (S.A.M. Cat. No. 2366) from the 



