740 



THE ANATOMY OF THE RUFFED GROUSE 



In the male, the testes are oval bodies lyin<; ventral to the anterior part of the kidneys. In 

 the breeding condition they are much enlarged. The epididymis i.s a mass of fine tubes con- 

 necting the testis with the ductus deferens which enters the cloaca just ventral to the entrance 

 of the ureter. The sperm pass from the testis through the epididymis and ductus deferens 

 to the cloaca. 



In the female, the sex organs consist of the ovary and the oviduct. Normallv. onlv those on 

 the left side develop. The ovary is in the same position as the testis and resembles a bunch 

 of grapes in appearance. The egg is extruded from the ovary into the infundibulum of the 

 oviduct. The chalaza is produced here, while the egg white is formed in the tube region, 

 and the shell and color are added in the uterus. These regions are poorly defined and cannot 

 be distinguished in the non-breeding condition. 



Abnormal conditions of the gonads are not infrequent. An ovotestis may develop or, under 

 certain conditions, the ovarv may atrophy on the left and then the right gonad develop into 

 a testis. Such abnormalities often have remarkable effects on the plumage and other secon- 

 dary sex characters. 



EXPLANATION OF ABBREVIATIONS USED IN FIGURES 78 & 79 



Ace 



Add. pro. 



Add. sup 



Amb 



Biceps 



Caudofem 



Cor. brach. post M. 



Cr. lat M. 



Cr. med. M. 



Delt M. 



Dors, soap M. 



Ext. d. coram. M. 



Fi-ni 



F. prrf. n 

 F. prrf. HI 

 F. prrf. IV 

 F. p. p. II .. 



M. 



..\I. 

 ...M, 

 ...M, 

 .M, 



F. p. p. ITT M. 



F. i>r..f. ..„ M, 



accessorii m. obturatus 



adductor profundus 



adductor siiperficialis 



ambiens 



biceps 



candofemoralis 



coracobrachiali^ posterior 



flexor cruris lateralis 



flexor cruris medialis 



deltoideus 



dorsalis scapulae 



extensor digiloriini coui- 



munis 



femnrocaudalis 



flexor perforaliis dipiti II 



flexor perforalus digili III 



flexor [>erforatus ilii;ili I\' 



flexor perforans et perfnra 



tus dipili II 



flexor perforans el perfnr:i- 



tus di^iti III 



flexor profundus 



gastrocnemius 



gastrocnemius, pars externa 



gluteus profuncbis 



iliactis. pars anterior 



flexor iliofemoralis 



extensor iliofibularis 



extensor iliotibialis anterior 



extensor iliotibialis lateralis 



flexor ischiofemoralis 



obturator 



pectoralis superficialis 

 . peroneus profundus 



peroneus superficialis 



piriformis 

 . psoas 



. supracoracoiileus 

 . tibialis anticiis 

 bial cartilage 

 . triceps 

 . vastus lateralis, pars externa 



vastus lateralis, pars niedius 



va-^tus niedius 



