418 J. Stapford, 



it is lengihened; the testes are long-er than broad; the vitellaria 

 are a pair of rods connected at tlieir centres by tlie vitelline diict. 

 At the füllest state of extension of the animal the vitellaria would 

 be straight, but under ordinary conditions they are more or less 

 wavy or folded or spirally twisted, conseqnently freqiiently ap- 

 pearing- miich like two rows of beads. The caeca have a like 

 Position to those of No. 2, and the similarly distributed nterus 

 forms a series of short, transverse folds, down one side and up 

 the other. 



Eg'g-s, taken from the vagina, and containing living- miracidia 

 that when liberated swim abont with g'reat rapidily, measure abont 

 •065 X "042 mm. The largest figures, obtained by cntting up alco- 

 holic Worms of this species and measuring the liberated eggs, were 

 •037 X '025, showing a very great shrinkage. In some Distomes, 

 e. g. the genus HaematoloecJms, the egg-shell is so dense in struc- 

 ture that it does not slirink under the influence of reagents. The 

 Contents may shrink, allowing the shell to wrinkle or fold, but one 

 can safely compare measurements of fresh and preserved eggs. In 

 Gorgodera it is otherwise — the softer nature of the shell permits 

 a withdrawal of water or other substance from it, and conseqnently 

 a shrinkage. That the Shells of the two genera named are to 

 some extent different in their Constitution can be judged by tlieir 

 colour — that of HaematoloecJms is deep brown, that of Gorgodera 

 gray. 



4. Gorffoäera attetiuata n, sp. 



This species resembles the last in its long, narrow, and deep 

 body and the proportional size, shape and position of its genital 

 Organs. It differs especially in its average size, the exact shape 

 of the body, in the vitellaria being closer to the ventral sucker, 

 and in the size of the ventral sucker. Although living worms may 

 exceed' 8 mm in lenght, an average individual among mounted spe- 

 cimens measures about 4"5X'55 mm. The centre of the ventral 

 sucker is about 1 mm from the anterior end, and the sizes of oral 

 and ventral suckers '280 and •670 mm. It thus diifers from all the 

 preceding species in the relatively large size of the ventral sucker, 

 which extends past the sides of the body and Stands out like a 

 bowl attached by its narrowed, closed base. The part of the body 

 behind the sucker may be of pretty uniform breadth for some di- 



