. On the anatomy of vertebrates [electronic resource] . m the upperpart of its crest the con-tour of the skull runsnearly straight to the foreends of the nasals, 15. Theorbits, small and with an . Hippopotamus amphibius. entire, or almost entire, rim of bone, singularly project both upward and outward, the frontals,n, rising toward them, and arching lengthwise across their upperhalf. The upper jaw, c, which is almost cylindrical in advance ofthe molar series, suddenly expands to form the alveoli of the uppertusks, the mandible similarly expanding for those of the lowertusks, c; in the upper ja
. On the anatomy of vertebrates [electronic resource] . m the upperpart of its crest the con-tour of the skull runsnearly straight to the foreends of the nasals, 15. Theorbits, small and with an . Hippopotamus amphibius. entire, or almost entire, rim of bone, singularly project both upward and outward, the frontals,n, rising toward them, and arching lengthwise across their upperhalf. The upper jaw, c, which is almost cylindrical in advance ofthe molar series, suddenly expands to form the alveoli of the uppertusks, the mandible similarly expanding for those of the lowertusks, c; in the upper jaw a second terminal expansion, divided bya deep groove from the first, increases the space for the large tusk-shaped incisors. The depth of the temporal fossas renders that partof the cranium, 7, narrower across than any part of the face : thefossas meet above to form a parietal crest in old males. The facialpart of the lacrymalis extensive, but the small deep-seated orbitalpart is perforated by the lacrymal foramen. The malar, 26, sendsVOL. II. H H. 466 ANATOMY OF VERTEBRATES. up a process to the postfrontal, which it rarely reaches : it ex-tends backward to the glenoid cavity, and forms the under part ofthe zygoma : the upper part is due to the squamosal, 27. The ex-ternal nostril is terminal, vertical, and formed by the nasals andpremaxillaries: the maxillaries are perforated by a moderatelylarge antorbital foramen far in advance of that cavity : the lateralseries of molar alveoli slightly diverge anteriorly—a dispositionwhich Cuvier regarded as peculiar to the Hippopotamus amongMammals. The bony palate is deeply notched anteriorly betweenthe premaxillaries : there are two pairs ofi foramina incisiva. Theascending ramus of the mandible, i, has a posterior convexly-curved outline descending to an antroverted angular process;the horizontal rami, divided by a deep notch from the angle, runforward almost parallel with each other, and expand at the sym-physis, along whose upper
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