NEW GENUS AND SPECIES OF THEROMORPHA 



555 



sutures. These figures will, I trust, render a detailed description 

 for the most part unnecessary. The points of interest meriting 



Fig. I. — Mycierosaurns longiceps Will. Skull from the side, n, nasal; pm, pre- 

 maxilla; m, maxilla; /, lacrimal; pf, prefrontal; pof, postfrontal; po, postorbital; 

 j, jugal; qj, quadratojugal; sq, squamosal; pa, parietal; /, frontal; ds, dermosupra- 

 occipital; so, supraoccipital; sa, surangular; ang, angular. 



discussion are the nares, orbits, lacrimals, the 

 boundaries of the temporal opening, and the 

 structure of the occiput. 



The nares are unusually large, as are also 

 the orbits. The latter are nearly circular in 

 outline, and look almost directly outward. 

 They project above the frontal region, which is 

 concave transversely between them. Within 

 the orbits the broad smooth upper surface of 

 the palatines is apparent, as also the narrow 

 pterygoid; both bear small, conical teeth. The 

 lacrimals do not reach the nares, as has been 

 assumed without positive proof for some of 

 the American Theromorpha. On the two sides 

 not only do the sutural lines agree exactly, but 

 the smooth, clean surface in front shows no 

 trace of a suture on either side. 



The jugo-postorbital arch is slender; on 

 the right side it is bent inward, separating at 

 the suture; on the left side it is broken in two 

 or three places. The quadratojugal is definitely 

 shown on each side. Because of the squamous 



Fig. 2. — Myctero- 

 saiirus longiceps. 

 Skull, from above. 

 Explanations as in 

 Fig. I. Both figures 

 natural size. 



