XI REPRODUCTIVE ORGANS AND THE FAT BODIES 213 



eggs reach their full development they break through the 

 follicle and the outer wall of the ovary, and are discharged 

 into the body cav- 

 ity. When the 

 eggs are all ex- 

 truded, the ova- 

 ries, which before 

 had filled the 

 greater part of 

 the body cavity, 

 become reduced 

 to small wrinkled 

 organs, containing 

 the minute ova for 

 the following year. 

 The oviducts 

 are a pair of con- 

 voluted tubes ex- 

 tending the length 

 of the body cavity 

 on either side of 

 the middle line. 

 They are sur- 

 rounded by peri- 

 toneum which is 

 continued dorsally 

 to form a sup- 



DOrtinS' membrane ^'^" 5^' — Urinogenital organs of a female frog. 

 ^ . ° ' N, kidneys ; Od, oviduct ; Ot, its opening into 



which extends to d^e coelom; Ov, ovary; /", opening of the ovi- 

 the dorsal body ''"'^' '"*° "^'^ cloaca; S, S' , openings of the 

 , . , . , ureters; Ut, uterine dilatation of the oviduct, 



wall outside of the ^^f,^.^ Wiedersheim.) 



mesovaria. Ante- 

 riorly, each oviduct opens by a wide mouth, or ostium, into 



