^°'i'9m'^''] Leach, The Myology of the Bell-Magpie. 21 



loi. The accessory semitendinosus. 



102. The semimemhranosus. 



103. The femoro-caudal. 



104. The obturator externus. 



105. The obturator internus. 



106. The gemellus. 



107. The adductor longus. 



108. The adductor magnus. 



93. The sartorius [22] [29] [31], the most anterior of the super- 

 ficial tieshy muscles of the thigh, arises from the anterior border of 

 the ilium and by a thin fascia from the neural spine of the fourth 

 dorsal vertebra. In Strepera it passes downward, becomes more 

 fleshy, passes round the patella, and is inserted in a semitendinous 

 fascia about the summit of the tibia. Shufeldt finds, in the 

 American Raven, that the sartorius is inserted into the patella 

 as well as about the tibia. It is not inserted into the patella in 

 Strepera and the Australian Raven. 



04. The gluteus primus [29] is extremely thin. In the central 

 part it is, indeed, but a tendinous fascia. It covers the edge of 

 the sartorius (93) in front. It arises from nearly the whole length 

 of the supero-internal margin of the ilium. In front of the 

 acetabulum the origin is a thin fascia : behind it is fleshy. The 

 fibres converge towards the patella. They join with the extensor 

 femoris (97), and form a tendinous coating for the knee. The 

 patella is formed in this " aponeurotic ligament." which is 

 inserted in the cnemial crest of the tibia. The central part of this 

 extensive muscle is almost entirely fascia-like, so that it might 

 almost be considered as consisting of two muscles. 



95. The gluteus medius [29] [32], a thick, fleshy muscle, arises 

 from the entire supero-internal margin of the front part of the 

 ilium. It fills the concavity and passes back as a strong tendon, 

 to be inserted on the proximal extremity of the femur. 



96. The gluteus minimus [32] is almost hidden by (95). It is 

 a small muscle running from the anterior edge of the outer side of 

 the iUum and the last rib. It forms a tendon which is inserted 

 into the outer aspect of the upper third of the femur. 



96a. The gluteus quartus [32] of Professor Mayer, quoted by 

 Owen (" Vert. Anat.," vol. ii., p. 100), is present in Strepera, the 

 Australian Raven, Gymnorhina, and Cracticus. It is a very small 

 muscle, arising, as Owen states, fleshy from the outer edge of the 

 ihum, posterior to the origin of the gluteus minimus (96). Its 

 fibres run parallel with those of that muscle and become tendinous. 

 The tendon winds up on to the outer face of the .femur, to be 

 inserted into the trochanter immediately below the insertion of 

 the gluteus medius (95). The gluteus quartus is quite hidden by 

 the gluteus medius. 



97. The extensor femoris [31] [32] is a powerful muscle consisting 

 of two well-marked parts— viz., the vastus externus and the 



