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Show 1866.] MR. ST. GEORGE MIVART ON MICRORHYNCHUS. 163 wards of the articular surface of the condyle ; but the vert ical groove and very deep digastric fossa are absolutely peculiar to the latter genus. Dimensions. Length from anterior end of the praemaxilla to anterior margin of foramen magnum Length from anterior end of the prsemaxilla to most anterior point of orbital margin Length between lines traversing most anterior and most posterior points of orbital margin Length from last to posterior end of skull Extreme width between outer margins of orbits.... Extreme width behind posterior roots of zygomata.. Width between nearest points of orbits Width between temporal ridges just behind orbits.. Width between temporal ridges at junction with lambdoidal Length of palate ... Breadth of palate between first premolars Breadth of palate at posterior end Length of nasals Breadth of nasals Length of lower alveolar margin from front of first premolar to behind last molar Length of symphysis Height of condyle above alveolar margin Height of coronoid process above alveolar margin .. inch. 75 40 60 03 53 13 43 90 35 81 40 40 35 25 73 64 32 48 After speaking of the skull, De Blainville says*:-"Quant au reste du squelette, je n'en ai vu qu'une partie des membres, et ils ^onservent toutes les particularites de ceux des Indris ; 1'humerus, perce" d'un trou au condyle interne, et egalant a peine la moitie de la longueur du femur ; le radius et le cubitus longs et greles ; le carpe sans os intermediaire; l'unciforme tres-grand; mais ici le meta-carpien de l'annulaire est notablement plus gros et plus long que celui du doigt median. Le femur et les os de la jambe, a peu pres egaux, sont long et greles, surtout le perone, et les os du tarse sont dans la proportion ordinaire." The few bones I have been able to examine are the following: - Humerus.-Not being able to ascertain the length of the spine I cannot compare the humerus with it; but it is doubtless of a similar proportion to that of Indris, as it agrees with the humerus of the latter animal in being so much shorter than the forearm. It has a strong sigmoid curve, stronger than in either Lemur or Indris, and the supinator ridge is more developed than in either. As in Indris, the internal condyle does not descend so nearly down to the free margin of the ulnar ridge of the trochlea as it does in Lemur. As ifi both, the bony canal is distinct, but not so large as in either; * Osteographie, Lemur, p. 23. |