1910. 



ORGANS OF THE FISH CHIMERA MOXSTROS'A. 



527 



ease in the immature female. Frequently the uterine portion 

 of one or other or both of the oviducts is found everted from 

 the genital opening. 



The above oviducal slit-like openings are almost anteroposterior 

 in position, and between them a rather wide ridge-like elevation 

 is present with a single median urinary aperture near the 

 posterior end of the ridge. 



Text-fig. 51. 



ur.hl. 



Dissection from right side of the posterior region of the urogenital organs of a 

 female adult Chimcera. 



all. p., left abdominal pore; an., anus; dig.gl., digitiform gland; diggl.op., its 

 opening; m.d.op., opening of left oviduct; m.d.', uterine portion of right 

 oviduct; m.s.', longitudinal duct receiving collecting ducts from the paired 

 portion of the kidney ; m.t., unpaired portion of kidney ; m.t.' , special ureters 

 from m.t. ; r., cut rectum; ur., opening of urinary bladder; ur.hl., urinary 

 bladder. 



Urinary Organs. 



These consist — as in the young male and female — of posterior 

 unpaired and anterior paired portions. The latter are strap- 

 shaped structures with indications of segmentation, especially 

 anteriorly, where they diminish in size, the front end being- 

 situated about the level of the shell- glands and the posterior 

 margin of the ovaries. By careful dissection the peritoneum 

 covering the most anterior isolated segments may be removed, 

 and they are then seen to lie on each side of the dorsal aorta. 

 The paired portions of the urinary organ pass into a single 

 median unpaired part behind, which is wide, deep, and triangular 



