Cestode of the Genus Zschokkeella. 47 



(2) A fusiform swelling on the inner half of the vagina. 

 (This has been interpreted as a receptaculum seminis, but in 

 the foregoing account of my species I have suggested that 

 there is probably such an organ distinct from this.) 



(3) A small and weak cirrus-sac. 



As far as these features are concerned, my species might 

 be referred to either genus. It differs from Inermicapsifer 

 in the following points: — 



(1) The genital pores are rather anterior than posterior on 

 the edge of the segment. 



(2) There appears to be no vesicula seminalis. 



(3) The uterus is fairly well developed before the appear- 

 ance of egg-capsules. 



It may be said to approach Inermicapsifer in one of the 

 points mentioned as distinctive (Beddard, 1912), viz., the 

 testes are divisible into two groups ; but they so nearly form 

 a complete series across the segment (except where inter- 

 rupted by the female organs) that it is difficult to say whether 

 their arrangement is more like that seen in Inermicapsifer or 

 that in Zschokkeella. In this respect the species seems to be 

 intermediate between the two genera. 



It resembles the described species of Zschokkeella in the 

 following points, besides the general features already 

 mentioned : — 



(1) The absence of a vesicula seminalis. 



(2) The presence of a fairly well-developed uterus in the 

 segments when they are first becoming gravid. 



As already pointed out, the testes are not quite, though 

 very nearly, in a continuous row. In this respect the species 

 shows a slight divergence from the type of Zschokkeella. It 

 also differs from it slightly in the position of tiie genital 

 pores, which are rather anterior to the middle of the edge of 

 the segment. The presence of more than one egg in each 

 egg-capsule does not seem to forbid the inclusion of the 

 species in Zschokkeella. 



The excretory system differs in its arrangement from that 

 described for the members of either genus. In both Zschok- 

 keella and Inermicapsifer the usual two distinct pairs of 

 longitudinal vessels, dorsal and ventral, are stated to be 

 present, the ventral vessels being of wider calibre than the 

 dorsal and situated almost in the same horizontal plane with 

 them, but more towards the middle line of the worm. 

 Further, in Zschokkeella "a fine capillary network in the 

 periphery of the cortical parenchyma connects all four excre- 

 tory vessels " (Ransom, 1909, p. 65). In Inermicapsifer the 

 main ventral vessels appear to be connected by a capillary 



