364 



AVES 



uterus Is considerably enlarged. Antiperistalsis of the oviduct 

 sometimes results in the formation of a new shell on an egg already 

 provided with one. 



Ovory - with 



ot/o of different siie 



■Funnel of oviduct 



•Kidney 



-Oviduct 



Ureter 



Sfiell glared 



-Rudimentary ritjflf 

 ov/duct 

 Vesicula s&niinolts \ \ \\ jl / / 



Openinq of the areter\ \ \\ \\ / y^ Opening of ureter- 



into tfie cloaca NsV'O^^^— ^5^/^ '"'" ''^^ clooca 



Open.no of vas deferensfii^^ ^'^^ Opening of oviduct 



,nto the clooca / ( j 1 ,„^„ ,^g cloaca 



-Cloaca ^-Cr^ ~Z^^ 



Cloaco 



Fig. 204. Reproductive system of the Fig. 205. Reproductive system of the 

 fowl, male. (Drawn by W. J. Moore.) fowl, female. (Drawn by W. J. Moore.) 



Nervous System. — The brain is short and very broad. The 

 cerebral hemispheres are large and the optic lobes immense. The 

 cerebellum is extremely large, indicating well-developed equilibration. 

 The olfactory lobes are very small. 



Sense Organs. — The bill and tongue are tactile organs; tactile 

 nerves are also present at the base of the feathers, especially the 

 wings and tail. The sense of synell is very poorly developed while 

 the sense of taste is poor but serviceable. Hearing is extremely 

 acute and vision is phenomenal. The eyes are very large and of a 

 biconvex shape. Birds have a tremendously developed power of 

 accommodation. They can swoop down to the water with great 



