The Quarterly journal of the Geological Society of London . , del DRYOPITHECUS FONTANi Lartet. Bemrose, Collo., Oerby Vol. 70.] LOWER JAW OF AN ANTHROPOID APE. 319 In the latter the digastric muscles are more or lessreduced, and Dryopithecus represents the stage in which thereduction had only just begun. So far as the shape of its mandible is concerned, Dryopithecusis, therefore, a primitive type ; and it is interesting to add thatthe relatively small size of its first molar is a character of theMacaques and other monkeys rather than of Anthropoids, althoughit is observable in so
The Quarterly journal of the Geological Society of London . , del DRYOPITHECUS FONTANi Lartet. Bemrose, Collo., Oerby Vol. 70.] LOWER JAW OF AN ANTHROPOID APE. 319 In the latter the digastric muscles are more or lessreduced, and Dryopithecus represents the stage in which thereduction had only just begun. So far as the shape of its mandible is concerned, Dryopithecusis, therefore, a primitive type ; and it is interesting to add thatthe relatively small size of its first molar is a character of theMacaques and other monkeys rather than of Anthropoids, althoughit is observable in some Gibbons. A comparison of the mandibular symphysis of Dryopithecuswith that of the existing Chimpanzee, Gorilla, and Orang, showsthat it is also of a generalized type. In adult individuals of Fig. 2.—Cross section of mandibular symphysis of Homo heidel-bergensis (shaded), superposed (a) on that of (outline) and (b) on that of Dryopithecus fontani(outline) ; natural size. Secondary bone at the origin ofthe geniohyoid muscles
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
