572 E. B. BRANSON 



upper corner of the quadrate, and takes no part in the articular 

 surface as it does in Mastodonsaurus. 



The orbits are in the anterior half of the skull and far apart, 

 "but they differ from those of Metoposaurus in being subcircular 

 instead of oval. In a skull of Metoposaurus diagnosticus 405 mm long 

 the orbits are 53 mm long by 32 mm broad. 1 In a skull of Anaschisma 

 4i5 mm long the orbits are 55 mm long by 49 mm broad. The external 

 nares are ovate, with the apex near the tip of the snout, and they are 

 larger and closer together than in Metoposaurus. In the skull of 

 Metoposaurus diagnosticus mentioned above the nares are 35 mm long, 

 27 mm broad, and 48 mm apart; while in the skull of Anaschisma they 

 .are 49 mm long, 36™ broad, and 35 mm apart. At the anterior end of 

 the nares there are openings through the premaxilla? for the reception 

 of the mandibular teeth. The parietal foramen is small, subcircular, 

 and located about one-fourth the length of the parietals from the 

 posterior end. No auditory slits are present, but the epiotics and 

 prosquamosals have a slightly concave posterior margin in the region 

 where the slits occur in other genera. 



The bones of the roof are sculptured much as in Metoposaurus, but 

 with much more of the space pitted, and without such long radiating 

 ridges and furrows as in that genus. The pits are not so large, and 

 the ridges between them are rounded instead of angular. None of 

 the space in the lyra is furrowed. 



The mucous canals of the lyra begin in a broad depression slightly 

 inside of the posterior inner border of the orbits, and pass forward 

 about i| cm inside the orbits, approaching a little nearer at their 

 anterior inner corner. From the posterior inner angle of the pre- 

 fontals the canals pass forward and outward in a straight line to 

 about the middle of the outer margin of these bones, and thence 

 forward in a straight line to the posterior outer corner of the nares. 

 From here they pass inward and forward, following the margin of 

 the nares. Near the tip of the snout the canals turn outward slightly, 

 become shallower and broader, and end at the margin of the pre- 

 maxillae. They are nowhere very deep, and they maintain a width 

 •of a little more than i cm throughout their length. 



The canals on the posterior part begin far back on the squamosals, 



1 Paleontographica, Vol. XXXVI, p. 142. 



