By William Wimsatt (Eds.)
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9. Ab Ac Cv Gf Gt Right shoulder without acromion process of humerus. 5 χ . axillary border base of (removed) acromion process clavicle glenoid fossa of scapula greater tuberosity (trochiter) of humerus Hh If Sf Sp St head of humerus infraspinous (postspinous) fossa supraspinous (anterior) fossa spine of scapula supraglenoid tuberosity Fig. 9. CO δ Ο 32 GLENN L . JEPSEN anatomy and habit that are parts of bat existence? Nothing in geology gives a definitive answer. Years and days were almost the same lengths in Mesozoic and early Tertiary time as they are now.
Right CI Η 1c Mc2-5 calcite filling of cavity in humerus humerus index claw (ungual phalange of second digit) metacarpals of second to fifth digits V varves (layi bow area. Pr2-5 4χ. proximal phalanges of second to fifth digits R radius S2-5 second (middle) phalanges of second to fifth digits Se sesamoid bone U ulna ? of sediments) BAT ORIGINS AND EVOLUTION 37 >—ι 38 GLENN L . JEPSEN dual wing membrane is comparatively nonvascular, apparently serving as an insulating sheet over the highly vascular ventral (palmar) layer.
Both groups hang by their supinated hind limbs, with their legs straight above their suspended bodies. Megabats habitually keep their heads in an upside down position. They eat in this attitude, observe their world from it and launch themselves from it (whether they are free-hanging from branches of trees or have their backs to a vertical surface of a tree or other shelter) by releasing the grasp of their feet and falling or pushing or flapping into the flight position wherein the head is topside up.