530 E. C. CASE 



collection is the posterior portion of the skull of a large Phytosaur 

 preserved in a soft yellow clay. The bones are somewhat rotted 

 and broken but, as is common in specimens preserved in such a 

 matrix, the sculpture and the sutures are exquisitely preserved. 

 Mr. Doughty was so kind as to loan this specimen to the author 

 for study and illustration. As preserved and collected, the pos- 

 terior part of the top of the skull and the left side are present as 

 far forward as the nares and the posterior end of the antorbital 

 opening. The lower part of the skull is lost "and the occipital 

 region is represented by a detached fragment. The skull was 

 distorted in fossilization so that the left temporal region is pushed 

 outward at a decided angle. Figures 5 and 6 show the sculpture of 

 the bones and the position of the sutures so clearly that extended 

 description is unnecessary. 



The lateral temporal opening is rhomboidal in outline with the 

 long axis inclined obliquely forward and back. Its upper border is 

 formed by the squamosal and postorbital. The squamosal is 

 fairly flat on the up'per surface and marked with a low relief of 

 broad rugosities. The descending process on the outer side is 

 smooth and widens toward its connection with the quadra to-jugal. 

 The posterior end is widened and the inferior face is marked by two 

 shallow, elongate, depressions, probably the location of cartilagi- 

 nous attachment to the opisthotic. Just anterior to these there is a 

 deep pit which received the head of the quadrate. There is a 

 total lack of any descending, hooklike process posterior to the 

 quadrate and defining the otic notch. 



The parietals are flat or sKghtly concave; the posterior ends 

 are broken off but there is clear evidence that the posterior ends 

 were below the level of the squamosals and that there was no 

 elevated arcade defining the posterior border of the upper temporal 

 opening. 



The quadrate was erect and its greatest breadth lay almost at 

 right angles to the squamosal and the quadrato-jugal. Its anterior 

 face is sharply concave, the inner border extends more forward 

 than the outer and is very thin; apparently only the lower part of 

 this inner edge united with the pterygoid. 



The quadrato-jugal is peculiar in its mode of articulation with 

 the jugal and the squamosal; the anterior and upper edges are 



