GALESAUKID^!. 69 



root of the lower. The four premaxillary teeth remain, 

 hut there are four cheek-teeth in the left maxilla. In 

 the description the narial aperture is stated to he single, 

 but it is clearly divided in the same manner as in 

 Lyeosawus. On both sides the temporal arcade shows a 

 longitudinal division indicating that it is composed of an 

 upper and a lower moiety. The lower arcade seems to be 

 undoubtedly a quadrato-maxillary one (as in Sjphenodon), 

 while the upper one would seem to be a squamoso-maxillary 

 one (as in the Dicynodontia, p. 39). The constituent 

 elements of the lower arcade cannot be determined ; but 

 the relations of the upper one confirm Cope's conclusion 

 that the postorbito-squamosal arcade of Sjohenoclon is absent 

 in this suborder. A figure of this skull is given in the 

 accompanying woodcut. 



By exchange with the Blomfontein Museum, 1884. 



Pig. 14. 



Galesaurus planiceps. — Left lateral aspect of the skull, f . a, an upper cheek- 

 tooth, and b an incisive tooth, f. From the Karoo system of South 

 Africa. 



R. 511 a. The imperfect skull ; from the Orange Free State. The 

 contour of the facial region is well preserved, but the 

 narial septum is broken away. Four posterior cheek- 

 teeth remain on the left side, five cheek-teeth being shown 

 in the opposite jaw. On the right side the lower (quad- 

 rato-maxillary) moiety of the compound temporal arcade 

 is preserved. Neither in this nor in the preceding speci- 

 men can it be determined whether the quadrate was 

 perforated. 



By exchange with the Blomfontein Museum, 1884. 



E. 845. Fragment of the middle region of the skull; from the 

 (Fig.) Orange Free State. A cast is shown of the anterior 



