598 E. B. BRANSON 



The bones in the roof of the skull resemble those in Actinodon 

 and Mastodonsaurus. The parietals, frontals, postfrontals, and 

 supraoccipitals are small. The prosquamosal is elongate, reaching 

 from just behind the orbit to the outer end of the quadrate. The 

 quadratojugal is long and narrow. The jugals are the largest bones 

 in the roof of the skull; they extend from a short distance behind the 

 nares to just in front of the outer end of the quadrate. The maxillae 

 are long, narrow behind, expanded anteriorly. The prefrontal is 

 pentagonal in outline. It unites with the postfrontal behind, exclud- 

 ing the frontal from the border of the orbits. The lachrymals are 

 elongate, pentagonal, and reach to the nares in front. The premaxillae 

 are greatly expanded. The nasals are elongate and subtriangular. 



The orbits are about the same size and in about the same position 

 as in the type of Eryops, though they are slightly farther apart. 

 The nares are ovate, situated at a considerable distance from the tip 

 of the skull, and are slightly larger than in Broili's specimens, though 

 smaller than in most other large Stegocephalians. The auditory 

 slits are very short and narrow. No parietal foramen is present. 



The anterior part of the roof is very finely sculptured with irregular 

 elongate and subcircular pits, the ridges between the pits becoming 

 tubercular near the median line of the skull. Toward the occiput 

 the sculpture becomes coarser, and on the outer part of the prosqua- 

 mosal the pits elongate to form radiating furrows. 



From the posterior part of the epiotic a prominent ridge passes 

 forward and outward to the back part of the orbit. A less prominent 

 ridge passes forward from the antero-inner corner of the orbit, and 

 gradually disappears about midway between the nares and orbits. 

 Just in front of the antero-outer corner of the orbits there is a large, 

 shallow depression, with a narrow furrow extending forward from 

 it for a short distance. About 5 cm behind the nares there is another 

 depression, but it is not so large as the one anterior to the orbits. 

 Running straight forward from it on the nasals there is an indistinct 

 narrow sulcus; passing outward from the posterior outer corner 

 there is a broader, less well-defined, sulcus which meets the sulcus 

 from the preorbital depression. Whether or not these canals are 

 homologous with the slime canals of other forms it is impossible to 

 say, but it seems probable that they are rudiments of such canals. 



