The specimen in question has very low and scarcely incurved maxillary crests; the shortest distance of which is two and two-thirds times greater than their greatest height, and although it still is in its “adolescent” stage, I should greatly doubt whether the crests in this species ever become developed to such a degree as, for instance, in _Hyperoödon diodon_ (Lacép.). The groove between the maxillary and the nuchal crest is very shallow. The maxillary notch is deep. The beak is long, making only a little less than half the length of the entire skull. Nares straight; right nasal larger than the left one, but not very much. The occipital condyles do not come in contact beneath the foramen magnum; the symphysis of the lower jaw is very short, amounting to only one-fifth of the whole length of the jaw. Want of time and books prevents me from making more extended remarks, and until I can present an exhaustive and comparative description, I shall have to content myself by giving a provisional table of dimensions. The following dimensions are in millimeters and English inches, and are in every case measured in a straight line: mm. in. Length of skull 1,405 55.32 Greatest breadth 698 27.48 Greatest height 530 20.87 Length from process of supramaxillaries before orbit 610 24.02 to posterior edge of condyles Length from same process to tip of beak 890 35.04 Depth of maxillary notch 50 1.97 Length of premaxillaries 1,222 48.11 Premaxillaries reach beyond supramaxillaries 134 5.28 Distance of upper edge of maxillary crests at their 228 8.98 anterior end Distance of same at their middle 358 14.10 Greatest height of maxillary crests 86 3.39 Length of visible part of vomer 325 12.80 Distance from anterior tip of vomer to tip of beak 275 10.83 Length of pterygoids 295 11.62 Height of foramen magnum 70 2.76 Width of foramen magnum 80 3.15 Distance of condyles at upper edge of foramen magnum 100 3.94 Closest approximation of condyles beneath the foramen 2 0.08 magnum Entire length of lower jaw 1,292 50.88 Height of lower jaw at second tooth groove 100 3.94 Length of symphysis 257 10.12 Greatest diameter of foremost tooth groove 100 3.94 (longitudinal)