578 



E. B. BRANSON 



Premaxillary foramina — 



Length 



Breadth 



Distance apart 



Distance from tip of skull 



Internal nares — 



Length 



Breadth 



Distance apart 



Distance from tip of skull 



Palatine foramina — 



Length 



Breadth 



Distance from premaxillary foramina. 



Distance from internal nares 



Distance from tip of skull 



Distance from end of condyle 



Infratemporal foramina — 



Length 



Breadth 



Distance apart 



Base of skull. — The base of the skull is in an excellent state of 

 preservation in A, but in B the upper part of the exoccipitals. the 

 opisthotics, and the downward projections of the supraoccipitals 

 are missing. The shape is well shown in Figs. 3 and 3a. The 

 roof is regularly convex; the under border nearly plane, save for a 

 downward projection at the union of the quadrate and pterygoid. 



The foramen magnum is large, oval, and no projections inward 

 from the exoccipitals tend to divide it into two parts as in Mastodon- 

 saurus and Metoposaurus. The foramen more nearly resembles 

 that of Capitosaurus stantonensis Woodward, though even in that 

 form there is a slight projection inward from the sides, while in 

 Anaschisma the sides are slightly concave outward. No fragments 

 of cartilage or bone are present to indicate the presence of partially 

 ossified basioccipitals or supraoccipitals, as in Capitosaurus stantonen- 

 sis Woodward. 1 Between the exoccipitals and opisthotics below, 

 and epiotics and supraoccipitals above, there is a small foramen, 

 rounded above and angular below. This foramen is homologous 

 with the posttemporal foramen of reptiles, as will be readily under- 

 stood by reference to the text-figure of the base of the skull of Eryops, 

 in which the relationship of the foramen is the same as in Anaschisma, 

 though the opisthotic and foramen are larger. 



1 Proceedings of the Zoological Society of London, 1904, Vol. II, p. 172. 



