164 



ZOOLOGY 



^m.ei 



8p.S 



Fia. «24.— The iirinogeiiital organs of Scyllium canicula from the ventral side. A, male, 

 and B, female. Only the anterior end of the gonad is represented in each figure, and except 

 that in B hoth kidneys are sho-wn, the organs of the right side only are drawn. In A the 

 seminal vesicle and sperm-sac are dissected away from the kidneys and displaced outwards, 

 and ■the uretei's inwards, ait. p, depression into which the ahdominal pore opens ; cl. cloaca; 

 da. clasper ; ef. d. efferent ducts of spermary ; Ic. kidney; k'., V. anterior non-renal portion 

 of the kidney, forming in the male the so-called " Leydig's gland," which, together with the 

 coiled speriniduct, constitutes the epididymis ; Jr. anterior portion of liver; w. d. vestigial 

 Mtillerian duct in the male ; <xh. gullet ; or. ovary ; ovd. oviduct ; ovd'. its coelomic aperture; 

 ovd"\ the common aperture of the oviducts into the cloaca ; r. rectum; sh. j;? shell-gland I 

 spd. spermiduct ; sp. s. spcrm-sau ; s. v. seminal vesicle ; s. v'. its aperture into the urino- 

 genital sinus; ts. s])crmary ; u. y. m. urinogenital sinus; ur. ureters; ur'. their apertures 

 into the urinogenital sinus ; «. s. urinary sinus. (From Parker's Practical Zoology.) 



