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The external surface of the right os innominatum.

Os Innominatum

The external surface of the right os innominatum.

The internal surface of the right os innominatum.

Os Innominatum

The internal surface of the right os innominatum.

"Fig 56 - Axial skeleton, minus the skull, of an owl, Asio wilsonianus, life size; from nature by Dr. R.W. Shufeldt, USA. at, atlas; ax,axis; cv, cervical vertebrae; c, c', cervical ribs, or free pleurapophyses; dv, dorsal vertebrae, excepting the last one, which joins the sacrum; R, two of the six true ribs (pleurapophyses), whereof sr is sacral; u, one of the five uncinate processes or epipleura; cr, two of the six sternal ribs(haemapophyses), whereof the sixth floats; p, pelvic or sacral region of the spine, comprehending one dorsal, and several lumbar, sacral proper, and urosacral vertebrae; I ilium; Is, ischium; P pubis; a, acetabulum; in, ischio-iliac foremen; o, obturator foramen; clv, caudal or coccygeal vertebrae, whereof py is the pygostyle; s, scapula; ohs, os humero-scapulare; cl, clavicle; C, coracoid; S, sternum." Elliot Coues, 1884

Axial Skeleton

"Fig 56 - Axial skeleton, minus the skull, of an owl, Asio wilsonianus, life size; from nature by Dr.…

"Diagrams of the girdles and appendages in a typical Vertebrate. A, anterior; B, posterior. ac., acetabulum, articulation of the humerus with its girdle; c, coracoid; ca., carpals; c.e., centralia; d.c., distal carpals; d.t., distal tarsals; el., elbow joint; f, fibula; fe., femur; fi., fibulare; gc., glenoid cavity, articulation of arm with girdle; h, humerus; il., ilium; in., intermediale; is. ischium; kn., knee joint; m.c., metacarpals (1-5); m.t., metatarsals (1-5); p, pubis; ph., phalanges (1-5); pr.c., precoracoid; r, radius; ra., radiale; sc., scapula; t, tibia; ta., tarsals; ti., tibiale; u., ulna; ul., ulnare." -Galloway, 1915

Vertebrate Appendages

"Diagrams of the girdles and appendages in a typical Vertebrate. A, anterior; B, posterior. ac., acetabulum,…