56. =Trunk= (_Truncus_). That portion of the body enclosing the
viscera and intestines, and carrying the neck and head at one end, the
tail at the other, as also the four limbs.
57. =Back= (_Dorsum_). The portion of the upper surface of the
trunk, from the neck to the rump, and corresponding to the dorsal
and sacral vertebræ.
58. =Upper back= (_Interscapulium_). The upper portion of the
back, or along the dorsal vertebræ; between the shoulder-blades,
and opposite the breast, sometimes called _dorsum anticum_.
59. =Lower back= (_Tergum_). The lower portion of the back along
the saeral region, from the upper back to the rump, and opposite
the belly, sometimes called _dorsum posticum_.
60. =Rump= (_Uropygium_). The portion of the upper side of the trunk
corresponding to the caudal vertebræ.
61. =Mantle= (_Stragulum_; _Pallium_). The back and the outside of
the folded wings taken together.
61½. =Ventral region= (_Regio ventralis_). Under side of body,
including breast and abdomen.
62. =Breast= (_Pectus_). The most anterior portion of the lower
surface of trunk, representing the region of the sternum or breast
bone (between the jugulum and the abdomen).
63. =Abdomen= (_Abdomen_). The under side of body, between the
breast and the anal region.
64. =Epigaster= (_Epigastrium_). The anterior portion of abdomen,
next to the breast.
65. =Belly= (_Venter_). The hinder portion of the abdomen, next to
the anal region or crissum.
66. =Anal region= (_Crissum_). The region around the anus, below
the tail, and opposite to the rump. Frequently includes under tail
coverts.
67. =Flanks= (_Hypochondria_). The sides of the soft parts of the
body.
68. =Humeral region= (_Regio humeralis_). The anterior portion of
the sides; that in which the wing is implanted.
E. The Tail (_Cauda_).
69. =Tail= (_Cauda_). The feathers forming the posterior extremity of
the body, implanted on the os coccygis, or rump bone.
70. =Tail feathers= (_Rectrices_). The long individual feathers
belonging to the tail.
71. =Tail coverts= (_Calypteria_). The feathers overlying and
covering the base of the tail feathers; the