14 



NEW KEPTILES AND STEG0CEPHALIAN8 FROM 



The infraorbital canal turns sharply inward across the short lachrymal bone and ]oms 

 the supraorbital; the single canal thus formed runs forward for a short distance and then 

 bifurcates on the anterior part of the maxillary just posterior to the narial opemng. 

 The outer branch runs forward for a short distance and termmates m an irregular expan- 

 sion The inner branch follows the normal course of the supraorbital canal; there is no 

 antorbital commissure. Posterior to the orbit the supraorbital canal is complete and 

 runs backward to join the temporal canal. It will be observed that the supraorbital 

 canal on the left side Ues for a short distance on the frontal; on the right side it does not 



pmx 



Fig. 1. — BueUneria perfecta, skull of, No. 7475, University of Michigan. 



A. Upper surface. B. Lower surface. 



C. Posterior surface. D. Lateral surface. 



pmx., premaxillary; 7nx., maxillary; n., nasal; pf., prefrontal; /., frontal; I., lachrymal; pto., post- 

 orbital; pi/., postfrontal; j., jugal; si.,supratemporal; p., parietal; sg., squamosal; qj., 

 quadratojugal; tab., tabulare; dso., dermsupraoccipital; eo., exoccipital; vo., vomer; 

 ps., parasphenoid; trf, transverse; pal., palatine; q., quadrate; xl, outlet for eleventh 

 nerve; a.pt., anterior rising process of pterygoid; p.pt., posterior rising process of ptery- 

 goid; qf., quadrate foramen; o., orbit. 



touch that element. The supraorbital and the temporal canals meet at a sharp angle, 

 and there is a canal connecting them with the infraorbital. Continuing backward, the 

 temporal canals he upon the supratemporal bones and turn sharply outward at their 

 posterior ends; on the left side the canal touches the anterior outer corner of the tabulare; 

 on the right side it clears that bone. The jugal canal continues backward to the ex- 

 tremity of the quadratojugal and, with a sUght interruption, turns inward for a short 

 distance near the posterior edge of the squamosal. 



The edges of the canals are irregular and the sculpture is continued on the bottom 

 of the grooves. It is evident that in this specimen there is a departure from the usual 

 and (according to Moodie) morphologically important position of the canals; that is. 



