UROGENITAL SYSTEM. 



325 



to the exterior by abdominal pores or by oviducts of varying lengths 

 (fig. 326, F). Concerning the nature of these ducts there is uncer- 

 tainty. They may be true Mullerian ducts or new formations within 

 the group. The fact that similar tubes occur, with permanently open 

 ostia in both sexes of the sturgeons (fig. 325), and that these open 



A 



gP s 

 up-.: 



FIG. 326. Diagrams of urogenital organs of female fishes, after Goodrich. A, Pro- 

 topterus; B, Polypterus; C, Amia; D, Lepidosteus; E, most teleosts; F, salmonid. ap, ab- 

 dominal pore; cb y cloacal bladder; d, cloaca;/, funnel of oviduct; gp, genital pore or papilla; 

 m, mesonephros; o, ovary; od, oviduct; r, rectum; s, urogenital sinus; up, urinary pore, 

 (papilla) ; ugp, urogenital pore (papilla) ; w, Wolffian ducts. 



behind into the Wolffian ducts, lends probability to the view that the 

 ducts of the ordinary teleosts are Mullerian in character, but greatly 

 modified. 



The saccular condition of the ovaries appears to arise in two ways. 

 In the one the primitively free edge of the ovary bends laterally and 

 fuses with the coelomic wall, thus enclosing a cavity, the parovarial 



