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The sternum consists of six pieces; the anterior or presternum is compressed and projects forwards like the prow of a boat.

Manubrium, mā-nū′bri-um, n. the presternum of most mammals: in organ-building, a stop-knob or handle.—adj.

Episternum, ep-i-ster′num, n. the interclavicle: the epiplastron: the presternum of mammals.—adj.

The yellow bats differ less from the red bats than does the hoary bat, L. cinereus, which differs from all of the others as follows: talonid on m3 larger; p4 single-rooted instead of double-rooted; hypocone on M1 and M2 smaller; coronoid process lower; ossified part of tympanic ring, which shields the petrosal, larger; humerus relatively shorter; forearm relatively longer; first phalanx of middle finger relatively shorter; presternum including keel longer than wide instead of vice versa.

In all bats the presternum has a prominent keel for the attachment of the great pectoral muscles.