1910.] 



ORGANS OF THE FISH CHIM.ERA MOXSTROSA. 



523 



The biconvex oval testes are closely similar in position and 

 appearance to the gonads of the young female, but possess a 



m.d.o.'' 

 ur. op. .-■-' 



Dissection of the urogenital organs of a young male Chimmra, ventral view 

 (nat. size). 



ctbd.f)., left abdominal pore; an., anus ; m.d., left middle clasper ; m.d., TMiillerian 

 duct; m.d.o., region where m.d. passes into wall of urogenital sinus; m.s., 

 paired portion of kidney ; m.s.', collecting ducts from m.s., opening into 

 Leydig's duct ; m.t., fused unpaired portion of kidney ; p.ol. left posterior 

 clasper ; pel., left pelvic fin ; v., rectum; sp.d., Leydig's duct; t.s., left testis; 

 ur.op., urogenital opening. 



