Fig. 1. View of superficial muscles of right thigh of Majaqueus cequinoctialis. 

 P. Pelvis, s. Sartorius. gl. 1. Gluteus primus, g. Gastrocnemius, b. Biceps, s.t. 

 Semi-tendinosus. s.m. Semi-membranosus. 



Fig. 2. View of deeper thigh muscles of the same bird ; the gluteus primus, biceps, 

 and gastrocnemius (</.) muscles cut and reflected to show the deeper parts. Lettering 

 as above ; also b'. cut end of biceps passing through the tendinous loop formed by 

 the origin of the gastrocnemius, f.c. Femoro-caudal muscle, a.f.c. Its accessory head. 

 o.e. Obturator externus. add. Adductor muscles, f.v. Femoral vein, sc. Sciatic nerve 

 and artery, o.g. Oil gland. 



Fig. 3. The same parts in Oceanites oceanicus. a.s.t. Accessory semi-tendinosus 

 muscle. Pb. Pubis. R. Rectrices. 



Fig. 4. Dissection of thigh of Pelecanoides, to show the absence of the accessory 

 femoro-caudal muscle, and the abnormal course of the femoral vein, this passing over, 

 instead of under, the femoro-caudal muscle, o.i. Obturator internus. gl. Glutei. 



