8 ON THE CRANIAL OSTEOLOGtY OF THE MASTIGURE LIZARD. [Jan. 17, 



in Uromastix spinipes the small bone which I term, following 

 Parker, second supratemporal. 



On the dorsal surface of the skull I desire to direct attention 

 to three features. In the first place, the parietal foramen lies 

 entirely in front of the fronto-parietal suture. Secondly, the 



Text-fig. 4. 



Squamosal region in various Lizards. 



A. Lacerta. B. Igtiana. C. Vromastix. D. Heloderma. 

 (Lettering as in text-figs. 2 & 3.) 



impaired frontal bone (text-fig. 2, p. 5) shows an unusual character, 

 which is, however, approached in the Monitor. On each side, 

 anteriorly, the bone sends a thin forwardly and outwardly directed 

 process which passes between the prefrontal and nasal of each side 

 and reaches the nasal vacuity. 



