ON CERTAIN MUSCLES OF BIRDS. 201 
Fig. 5. 
pp 
Bi, TN 
Outer view x of right thigh of Bernicla brenta, partly dissected. 
s, sartorius; oe, obturator externus; 4d, adductor; 5, biceps; fc, femoro-caudal, 
afc, accessory femoro-caudal; st, semitendinosus; sm, semimembranosus ; 
P, pubis ; fv, femoral vein. 
F The ambiens is present in :— 
Pterocles alchata. Chamepelia talpacott. 
arenaria. Metriopelia melanoptera. 
Lopholemus antarcticus. Tympanistria bicolor. 
Columba enas. Leptoptila jamaiéensis. 
livia. Chalcophaps chrysochlora. 
—— leucocephala. Ocyphaps lophotes. 
—— picazuro. Phaps chalcoptera. 
—— maculosa. -Carpophaga globicera. 
—— vinacea. —— enea. 
Turtur senegalensis. Calenas nicobarica. 
— aldabranus. Diduneulus strigirostris. 
Chaleopelia chalcospilos 
The ambiens is absent in :— : 
Goura coronata. -Geopelia striata. 
—— victoria. —— placida. 
