. On the anatomy of vertebrates [electronic resource] . xtent: it is flatter and developed more trans-versely in the Tr. niger. The larger proportional size of thecanines in Tr. Gorilla impresses a corresponding difference uponthe alveolar part of the maxillary bone in that species. Fig. 357contrasts the broad flattened superoccipital surface of the Gorillawith the convexity of the same part in the Tr. niger, fig. 356 : thedifference is due to the much thicker and broader lambdoidalridge in the larger species, which prolongs the surface beyond thecerebellar fossa, and gives the condyles and fo
. On the anatomy of vertebrates [electronic resource] . xtent: it is flatter and developed more trans-versely in the Tr. niger. The larger proportional size of thecanines in Tr. Gorilla impresses a corresponding difference uponthe alveolar part of the maxillary bone in that species. Fig. 357contrasts the broad flattened superoccipital surface of the Gorillawith the convexity of the same part in the Tr. niger, fig. 356 : thedifference is due to the much thicker and broader lambdoidalridge in the larger species, which prolongs the surface beyond thecerebellar fossa, and gives the condyles and foramen magnum arather more advanced position as compared with the Tr. next character, explicable in relation to the greater weight ofthe skull to be poised upon the atlas, is the greater prominence ofthe mastoid processes in the Tr. Gorilla, which are representedby only a rough ridge in the Tr. niger. These protuberances arecellular, and with a very thin outer layer of bone in the The lower surface of the long tympanic or auditory. 538 ANATOMY OF VERTEBRATES. 359 process is smooth and flat, or slightly concave, in Tr. niger, anddevelopes a slight tubercle anterior to the stylo-hyal pit: in theTr. Gorilla the same process is more or less convex below, anddevelopes a ridge, answering to the vaginal process, on the outerside of the carotid canal. The processes posterior and internal tothe glenoid articular surface are better developed, especially theinternal one in the Tr. Gorilla, than in the Tr. niger: the ridgewhich extends from the ecto-pterygoid along the inner border of theforamen ovale terminates in Tr. Gorilla by an angle or processanswering to that called i styliform or £ spinous in Man, but ofwhich there is no trace in the Tr. niger. The palate is narrower in proportion to its length in the Tr. Gorilla, but the premaxillaryportion is relatively longer inTr. niger. Two anterior palatineforamina, one on each side thealmost confluent incisive fora-mina
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