534 -E. C. CASE 



The opisthotic and pterygoid join the quadrate by separate attach- 

 ments in a manner quite different from that suggested by Huene, 

 Figure i6. From this and all other described Phytosaurs it differs 

 in the absence of a descending hook from the squamosal posterior 

 to the quadrate, outlining the otic notch. 



From Paleorhinus^ it differs in the more posterior position of 

 the nares, these lying over the antorbital opening as in the Phyto- 

 saurus type rather than anterior to it as in the Mystriosuchus 

 t3rpe. The nasals are shorter and do not separate the nares nor 

 extend anterior to them. No otic foramen is present. The 

 quadrate foramen is entirely on the posterior face of the skull. 

 The pre-frontal is much shorter and lies almost entirely anterior 

 to the frontal. The lachrymal is stouter and forms a broad bar 

 between the orbit and the antorbital opening. There is no evidence 

 of a depression extending to the lachrymal from the posterior edge 

 of the antorbital foramen and the lachrymal had little or no 

 connection with the maxillary. The lower edge of the lateral 

 temporal opening is convex upward, not concave. 



From Angistorhinus it differs in the quadrangular rather than 

 the oval form of the lateral temporal opening; in having the 

 parietal-squamosal arcade depressed; in that the orbits are rounded 

 instead of oval; in the position of the orbits which are more anterior 

 in reference to the lateral temporal opening; in that the parietals 

 meet anteriorly in a recess rather than in a point; and in that the 

 opisthotic is more spatulate at the outer end. 



From Machaeroprosopus it differs in the greater distance 

 between the center of the orbit and the posterior end of the nares, 

 74 mm. instead of 40 mm. The nasals do not include nor extend 

 in front of the nares. The frontals are longer and narrower; the 

 jugals probably take little part in the posterior edge of the antorbital 

 foramen. The quadrate foramen is small. The pterygoid is absent 

 but it does not appear that there could have been any extension 

 in the form of a wedge or hook between the quadrate and quadrato- 

 jugal, as described and figured by Mehl. 



I Bibliographies of the American Triassic Phytosaurs are given by McGregor, 

 Mem. Am. Mus. Nat. Hist., Vol. IX (1906), Part XI; and Mehl, Jour. GeoL, Vol. 

 XXIII, No. 2, 1915. 



