ON CERTAIN MUSCLES OF BIRDS. 199 
Outer view of right thigh of Phalacrocorazr carbo, dissected. 
tf, tensor facie; gl Iv, gluteus quartus; oe, obturator externus; fc, femoro- 
caudal; Ad, adductor; 4, biceps; st, semitendinosus; sm, semimembranosus ; 
Pb, pubis. 
side of the knee, which runs upwards from it to the outer side of the 
anterior fibrous expansion over the joint. . 
Species examined. 
Sula bassana. Phalacrocoraz lugubris. 
Phalacrocoraz carbo. 
The Ardeide possess the femoro-caudal—though in some, as Ardea 
goliath, it is extremely narrow—the semitendinosus, the accessory 
semitendinosus, and the postacetabular portion of the tensor fascize 
which is very slightly developed; the ambiens and the accessory 
femoro-caudal are absent. 
Species examined. 
Ardea cinerea. Ardea egretta. 
goliath. garzetta. 
—— purpurea. Nycticoraz europeus. 
alba. Botaurus stellaris. 
