240 S. J. JOHNSTON. 



The genital pore is on a level with the posterior end of 

 the pharynx. The cirrus sac, of narrow and tubular form, 

 almost entirely filled by the coiled vesicula seminalis, lies 

 in front of the intestinal fork, sometimes crossing the 

 anterior edge of the latter with its posterior end. The 

 testes are of large size, irregular in shape, and situated 

 side by side at the same level, one on either side of the 

 middle line. They are equal in size, 1*36 x 0*97 mm. The 

 ovary is on the right side just in front of the middle of the 

 right testis. It is spherical in form, 0*446 mm. in diameter. 

 The " shell-gland" is large, situated on the postero-median 

 aspect of the ovary. 



The yolk glands, consisting of comparatively large, very 

 numerous oval follicles, 0*059x0*064 to 0*08x0*064 mm., 

 extend from the posterior end of the pharynx to a level 

 behind the intestine in the posterior end of the body. In 

 some of the individuals the yolk glands extend further 

 forward on one side than the other. They are confined to 

 the lateral fields of the body, lying entirely between the 

 intestine and the sides of the body, and are separated at 

 the posterior end by a distinct interval. The uterus is 

 very long and voluminous, and is arranged in a number of 

 loops in the way that seems to be characteristic of Cyclo- 

 coelum; the loops for the most part lie between the middle 

 line of the body and the lateral edges, only a few running 

 right across the body. They do not anywhere pass out 

 beyond the intestinal limbs, nor backward behind the 

 testes. 



The eggs are large and oval and show the characteristic 

 increase in size as one proceeds along the uterus from the 

 ovary. Each egg contains a miracidium with a pair of 

 black eye-spots fused together. The eggs which are very 

 thin- walled, vary in size from 0*117 x 0*059 to 0*139 x 

 0*059 mm. 



