ANGISTORHINUS, A NEW GENUS OF PHYTOSAURIA 187 
produced into a long, slender, subcylindrical rostrum. Near the 
anterior end the rostrum expands rather rapidly and is bent abruptly 
downward at right angles to the axis of the posterior portion. This 
downward extension reaches a distance of 35 mm. below the ventral 
plane of the rostrum. The anterior border of the nares is about 
even with the anterior border of the antorbital vacuity and about 
590 mm. from the tip of the rostrum. The nares are elevated on a 
prominence that extends slightly above the plane of the inter-orbital 
region. This prominence is accentuated by a_ saddle-shaped 
depression immediately back of the nares. The antorbital vacuities 
are large and are oval in outline, about 130 mm. long and 55 mm. 
wide. ‘The orbits are separated by an inter-orbital space of 68 mm. 
They are oval, about 89 mm. long and 55 mm. wide, and their 
Skull and mandible of Angistorhinus grandis. Lateral view, about one-ninth 
natural size. 
planes are directed outward and a little less upward. The latero- 
temporal fenestrae are exceptionally large, being about 171 mm. 
along the greatest diameter. They reach back and upward to 
such an extent that only a narrow bar of bone separates the supra- 
temporal and the latero-temporal fenestrae. The supra-temporal 
fenestrae are large, more or less oval in outline, about 84 mm. long 
and 46 mm. wide. The posterior border, the parieto-squamosal 
arcade, is well developed. It is formed by a rather broad, platelike 
bone (the sutures have not yet been made out) that lies in the plane 
that extends over the posterior dorsal surface of the skull. The 
posterior border of the skull, as seen from above, is incised by a 
broad, rather deep notch. _ Still, the posterior border of the parietals 
at the median line extends beyond the occipital condyle fully 11 
mm. The downward extension of the postero-lateral portion of the 
