250 THE MYOLOGY OF THE RAVEN. 



We find a well-developed popliteus muscle in Geo- 

 coccyx calif ornianus , where it is seen to arise from an 

 oblique line on the back of the tibial shaft below the 

 head of the bone, and the fibres converging to pass 

 upwards and outwards are inserted by a short tendon 

 into the corresponding aspect of the head of the fibula, 

 close to the superior fibres of insertion of the flexor 

 perforans digitorum profundus. 



The several flexor muscles of the pelvic limb of the 

 Raven which we have been describing in the last few pages 

 can be compared with great profit with the corresponding 

 muscles as they occur in a bird with zygodactyle feet. 

 The species to which we have been referring for that 

 purpose in this work is Geococcyx ccd if ornianus, and, as 

 has already been noted, the writer presented some ob- 

 servations upon its myology in the Proceedings of the 

 Zoological Society of London for 1886. From that 

 paper I here republish my remarks upon these flexor 

 muscles as they were found to exist by me in Geococcyx, 

 in order that the comparisons can be made which have 

 been suggested above. I remarked that in Geococcyx 



Popliteus. Owen. 



,, Quennerstedt, p. 36. 



,, Neander, p. 21. 



Gadow, No. 28. 



,, Watson, p. 116. 



Kniekehlenrauskel. Meckel, System, p. 369, No. 2 ; Arckiv, p. 272, 



No. 11. 

 Le poplite. Gervais et Alix, p. 33. 



" Ausserordentlich klein ist der M. popliteus bei den kletterndeii 

 Yugeln, auch bei Ciiculus, wahrscheinlich ganz fehlend bei Psittacus, 

 Picus, und Cypselus. Dagegen ist er recht ansehnlich bei Capri- 

 mulgus, Strix, Buteo, Gallus, Numenius. Schwach bei Anser, Grus, 

 Fulica, Larus, Colymbus, Ciconia, Serpentarius." 



