1910.] 



ORGANS OP THE PISH CHIM/ERA MONSTROSA. 



521 



Briefly, then, it may be stated that the function of the anterior 

 part of the sperm-vesicle is that of storing up the vast number of 

 spermatozoa produced in the testis, and it is in this region that 

 there are temporarily spermatophores. In the middle region 

 (pale green), the spermatozoa are thoroughly mixed with the 

 secretion of Leydig's gland, while the posterior part of the vesicle 

 serves as a receptacle where the free spermatozoa are collected, 

 and most probably also nourished, by the above secretion. 



per. . .... i 



sp! 



par. 



Transverse section of sperm-vesicle in region VI of text-fig". 41. 



b.v., blood-vessel ; cm., circular layer of muscle-fibres and connective tissue ; par., 

 partitions giving rise to diverticula in the vesicle-wall ; per., peritoneum ; 

 sp.', region containing numerous free spermatozoa, sp.", diverticula where 

 spermatozoa are found mixed with a large amount of secretion from Leydig's 

 gland ; sp.'", region where the spermatozoa are very widely separated and 

 mixed with albuminous material. 



Sperm-sacs. — No trace of these structures is found, and this is 

 to be expected if the sperm-sacs are formed from the lower ends 

 of the Miillerian ducts (see Borcea, 13), for the Miillerian ducts 

 of the male Chimcera persist, although in an undeveloped 

 condition (see below). 



Urinary Organs. 



The glands of Leyclig pass posteriorly into the true kidney, 

 which consists of right and left halves, partly separated by con- 

 nective tissue in front, but completely fused behind into a median 

 brownish-red structure situated dorsal to the ends of the seminal 

 vesicles. The kidney ends posteriorly in a conical portion, which 

 extends beyond the caudal limit of the abdominal cavity. It is 

 drained by six pairs of ureters which open together into the uro- 



