American Represeutatives of Distoinura variegatum. 905 



The testes are situated in tlie ceiitre of the posterior two-thirds 

 of the bod}^ — the first one on the opposite side from the ovary 

 and the second on the same side as the ovary. They overlap, to 

 the extent of about lialf their lengtli, and are irregulär and variable 

 in outline, frequently having bluut lobes on the outer sides but 

 sometimes on both sides. The posterior one is mostly the larger. 



The vitellaria are similar to those of the preceding species. In 

 my larg-est mounted specimen, I have counted thirteen clustei's on 

 one side but generally I could not see that there was a g-reater 

 number than in the former species. The number of follicles appears 

 to be fewer (8 to 15) in a bunch but the follicles are larger than 

 in No. 1. Their measurements are difficult to fix and appear to vary 

 with the size of the worm and the number in a bunch but perhaps 

 •16 to '18 mm is an approximate figure for the length of one, 

 viewed from its side, in a mounted worm. 



The Uterus in this species is more complexly folded than in 

 No. 1, the complexity being due to the greater length of its median, 

 ascending portion. This forms a number of irregulär coils behind 

 and in front of each testis and anteiior to the ventral sucker, where 

 it forms broad transverse folds. The posterior lateral folds, outside 

 of the ends of the intestinal caeca, are short, extending only to the 

 level of the posterior testis on one side, and to its middle on the other. 



The egg is of the same size, shape, and colour as that of No. 1. 



Young animals of this species, of 5 or 6 mm length and 1 mm 

 breadth, are most beautiful objects. At a length of 3"3 mm and 

 breadth of '6 mm the ovary is lobed and the testes show vsigns of 

 lobation, the posterior lateral loops barely curve round the ends of 

 the caeca and the median band of the oviduct is almost straight, 

 while the vitellaria ai-e well formed, A few eggs are present in 

 the Uterus, but they are small and round or badly formed. The 

 youngest specimen I have, that I can recognize as belonging to this 

 species, is 1*14 mm long by "27 mm broad. Its intestine is fllled 

 with black pigment and the rudiments of ovary and testes have 

 their characteristic position. The testes are also long and narrow 

 and the posterior one a little irregulär in outline. The size of the 

 ventral as compared with the oral sucker is 3:5. 



