. Fig. I. Lateral view of skull and lower jaw. ( x \.) The second feature referred to by Flower, and visible in the lateral view of the skull, is the much larger size in H. planifrons of the crest formed by the vertex behind the nares. Not only is it much larger than in H. rostratus but it differs somewhat in shape, overhanging the narial area considerably, whereas in H. rostratus the anterior face of the crest viewed in profile is approximately vertical. Other differences will be mentioned when describing the dorsal aspect. In skulls of comparable size the distal portion of the rostrum is mor
. Fig. I. Lateral view of skull and lower jaw. ( x \.) The second feature referred to by Flower, and visible in the lateral view of the skull, is the much larger size in H. planifrons of the crest formed by the vertex behind the nares. Not only is it much larger than in H. rostratus but it differs somewhat in shape, overhanging the narial area considerably, whereas in H. rostratus the anterior face of the crest viewed in profile is approximately vertical. Other differences will be mentioned when describing the dorsal aspect. In skulls of comparable size the distal portion of the rostrum is more slender in H. rostratus than in H. planifrons. The differences which exist in the proximal portion are associated with the dis- similarity of the maxillary crests. The distance of the maxillary tip from the tip of the premaxilla is alike in both species. The extent to which the lachrymal is seen in the lateral view appears to be equally variable in both species. The type specimen of H. planifrons has the left lachrymal completely separating the malar anteriorly from the orbital process of the frontal posteriorly and it has a wide contact with the maxilla. In the Discovery specimen it hardly appears in lateral view. It does not nearly reach the maxilla, and
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