

1910.] 



ORGANS OF THE FISH CHIMERA MONSTROSA. 



519 



of which the cavities marked la. in text-fig. 46 are connected. 

 On the right side of the figure the last five ducts from the gland 

 of Leydig are cut across (m.s. 1 ). 



Text fig. 45. 



sp.- 



par. 



par. 



Transverse section of sperm-vesicle in region III of text-tig. 41. 



b.v., blood-vessel ; cm., circular layer of muscle fibres ; par., partitions projecting 

 from sperm-vesicle wall ; sp., region where spermatozoa are free j sp.', region 

 where spermatozoa are collected into bundles. 



In the next figure (text-fig. 47) a section in region V of text- 

 fig. 41 or c of text-fig. 42 is shown with the structure ax. again 

 present, with the wall of the vesicle much increased in thickness 

 due to the presence of unstriped muscle-fibres and connective 

 tissue, and with the collecting ducts m.s.' from Leydig's gland seen 

 approximating to the structure ax. into which they ultimately 

 open. In the vesicle wall now appear numerous diverticula sp." 

 containing loose free spermatozoa and nucleated material secreted 

 by the gland of Leydig. Lastly, in the posterior region of the 

 sperm- vesicle (marked VI in text- fig. 41) the structure ax. is 

 absent, due to the dilatation of its channels, their fusion with one 

 another, and the formation of a cavity into which the diverticula 

 of the sperm-vesicle wall open (text-fig. 48). The diverticula 

 contain peripherally (between the thick partitions) spermatozoa 

 mixed with nucleated matter, whereas the central cavity contains 

 free and widely separated spermatozoa floating in albuminous 

 material in great abundance. 



