MOEPHOLOGY OF THE OWLS. 43 



D. Pelvic Girdle *. 



Innominate fused with synsacrura ; preacetabulai* ilium very long ; pectineal process wanting ; the 

 preacetabular ilium with a deeply emarginate inferior border ; the dorsal plane of the postacetabular 

 ilium continued forwards and outwards to form a conspicuous shelf overhanging the acetabulum ; 

 ischium continued backwards into a point along the pubis; pubis always complete; an iliac recess 

 always present. 



E. Pectoral Limb. 



Humerus with a moderately large, rounded, pectoral crest, a small ectepicondylar, and large, swollen 

 eutepicondylar tuberosities, a deep liuguiform impression for the brachialis inferior ; the sulcus trunsvei'suK 

 obsolete, the impression for the pectoralis occupying nearly the whole of the pectoral crest, and the 

 impression of the deltoideus major extending for a considerable distance down the shaft. 



Forearm and hand non-pneumatic. Radius bearing a slender bony arch or traces of it, on the second 

 fifth of the postaxial boi'der, and a sesamoid at its distal end. 



Manus with the proximal end of Mc. Ill joining Mc. II distad of the articulation of the pollex with 

 its metacarpal ; Ph. 1 of D. II with a deeply emarginate postaxial border. 



F. Pelvic Limb. 



All the bones non-pneumatic ; ecto- and ento-cnemial crests not feebly developed ; a til)io-tarsal 

 extensor bridge wanting ; hypotarsus simple ; Mc. I very short. 



A. Phalanx 1 of D. II short; Ph. 2 of D. Ill short; tarso- metatarsus with a strong 



extensor bridge Asionid.e. 



B. Phalanx 1 of D. II long; Ph. 2 of D. Ill long; tarso-metatarsal extensor bridge 



wanting Strigid.e. 



List of the more important Works and Papers referred to 



or consulted. 



1. Adolphi, H. — " Ueber Variationen der Spinalnerven und dcr Wirbelsiiule anurer Amphibien," 



Morphol. Jahrb. xxv. (1896). 



2. Bateson, W. — Materials for the Study of Variation. 1891. 



3. Beddard, F. E. — Structure and Classification of Birds. 1898. 



4. Beduard, F. E.— "On Photodiius badius," Ibis, 1890. 



5. Beddard, F. E. — "On the Classification of the Striges," Ibis, 1888. 



6. Collett, C— " On the Asymmetry of the Skull in Strix Tengmalmi," P. Z. S., 1870. 



7. Cole, F. J. — " Some Variations in the Spinal Nerves of the Fi"og, with a Note on an Abnormal 



Vertebral Column," Trans. Liverpool Biol. Soc, vol. xv. (1901). 



8. CouEs, E. — Key to N.-American Birds. 



9. D'Alto.v. — De Strigum Musculis Commentatis. Halis, 1837. 



10. Evans, A. H.— Birds. 1899. 



11. Gadow, H. — "On the Evolution of the Vertebral Column of Amphibia and Amniota," Phil. Trans. 



Roy. Soc, B. vol. clxxxvii. (189G). 



12. Gadow, II. — Bronn's Thicrrcich, Bd. vi. Vogci, 1891. (Anatom. Theil.) 



13. Gadow, H. — Bronn's Thicrrcich, Syst. Tlioil. 1893. 



* The variation of the pelvis among the Striges is so slight that workable characters for distinguishing the 

 Families and (Jenera cannot be founJ. 



