416 J- Stafford, 



pore is to be foiind tlie conspicuous, but verj^ sliort and broad, 

 vesicula seminalis. 



I have no nieasurements of living eg-gs, and, according to my 

 experience with otlier members of tliis group, preserved eg-gs are 

 considerably shnmken. Those liberated from alcoholic specimens 

 nieasured iip to •04X-028 mm. The unstained worms preserve a gray 

 coloiir with the iiterus, testes, ovary, vitellaria, vesicula seminalis, 

 and suckers darker, approaching- to a light brown. 



2. Govffodera oj^aca n. sp. 



This species occurs with the preceding, in the bladder of Bnfo 

 lentiginosus, but not so abundantlj^ In the lot of 50 or 60 already 

 mentioned there were but 3 of this form. They are easily dis- 

 tinguished on account of their shorter, deeper, rounder, heavier, and 

 completely opaque bodies. The largest I have measures 7-59 mm 

 Xl'24 mm, wliile the one fig'ured is 6-58xl'39 mm, They are thus 

 a little shorter and g-enerally a little narrower than No. 1. The 

 point of greatest breadth is displaced backwards and the hind end 

 is not so narrow or pointed. Transverse sections prove that this 

 species is 1-5 times as thick as the former (comparing- worms of 

 equal length), which partly accounts for its opacity. 



The suckers are essentially the same as in No. 1 with the 

 exception that the ventral sucker seems to have a slightly smaller 

 Proportion to the mouth sucker (oral: ventral = 1:1"5). 



After making- the worms transparent by the use of a Clearing- 

 reagent, the disposition of the reproductive organs can be determined. 

 Corresponding- with the level of greatest breadth of the body the 

 genital giands are displaced backwards, so that the distance between 

 ventral sucker and ovary is nearly twice as great as in the preceding 

 species, and the area occupied by ovary and testes is greatly reduced. 

 These organs are situated left, right, left, and a greater distance 

 lateralw^ards from the median line than in No. 1. They are all 

 Short, compact bodies, slightly longer than broad and, especially in 

 the testes, in marked contrast to the correpsonding parts of 

 G. translucida. The paired vitellaria lie immediately in front of 

 the ovary and are irregulär, lengthened bodies, connected at their 

 middles by the transverse vitelline duct. Perhaps the first thing 

 to attract ones attention is that the folds and coils of the uterus 



