AMERICAN LABYRINTHODONTIDM SIS 



Anaschisma as seen from above. The anterior part of the cultriform 

 process resembles that of Capitosaurus. 



The pterygoids form a considerable portion of the back part of 

 the under side of the skull. A long anterior wing, about ^2 mm wide 

 posteriorly, but broadening abruptly to a width of 52 mm , 6o mm in 

 advance of the posterior part of the palatine foramina, separates 

 the palatine and infratemporal foramina, and articulates with the 

 parasphenoid and exoccipitals. The posterior outer wing is narrow 

 where it diverges from the main part of the bone, but broadens 

 abruptly, sending up a broad triangular wing, which reaches the 

 prosquamosal above, articulates with the quadrate at its outer end 

 and forms a large part of the base of the skull. In the middle of 

 the lower portion on the posterior side of this broad wing there is a 

 deep, oval pit, with a groove running forward from it. 



Passing upward from the pterygoid, just in front of the place 

 where the posterior wing diverges, there is a slender, incompletely 

 ossified bone that ends freely above. If the slender column continued 

 upward, it would articulate with the parietals above. In Gond- 

 wanosaurus, 1 two slender bones articulate with the parietals above, 

 and it is probable that these are the same elements that occur in 

 Anaschisma, though more completely ossified in the former genus. 

 This bone is probably the epipterygoid. 



The palatines are long and slender. The posterior part reaches 

 as far back as the hinder part of the orbit, and is wedged in between 

 the maxillary and the transverse. A slender branch, with a minimum 

 width of i cm , passes inward between the palatine foramen and the 

 internal naris, and articulates with the pre vomer. Between the 

 naris and the maxilla the bone is narrow, but it broadens again in 

 front of the naris. About 2 cm anterior to the naris there is a large 

 tooth, and just in front of this the palatine articulates with the pre- 

 maxilla. The palatine bears only the one tooth. 



The pre vomers are paired. Posteriorly they are separated by 

 the cultriform process of the parasphenoid, but anteriorly they meet 

 in a suture in the median line of the skull. A slender, tapering 

 process runs backward from the posterior inner part of the bone 



1 Paleontographica Indica, Series IV, Vol. I, "The Bijori Labyrinthodont," p. 4, 

 Plate I. 



