ELLOBIOPSIDAE 



297 



In Fig. 8/ the organ of fixation forms a kind of neck protruding towards the body wall of the host. 

 The ventral nerve cord is connected to the body of the host by means of a broad mass of tissue. 

 Several large roots are visible here (one in the musculature at some distance from the median plane, 

 at the left side of the figure), and numerous smaller roots. 



O'- 



Fig. 8 a-/. Transverse sections of the central part of the ventral region of the first abdominal segment of Hoplophorus grimaldii 

 Coutiere, Wfith Amallocystis umbellatus n.sp., type specimen, a from a slightly more anterior region than b, each following 

 section from a more posterior region. Stalks, trophomeres and gonomeres omitted. Letters as in Fig. 7. x 45. 



Fig. 8^ shows the organ of fixation in the region in which it attains its largest size. Its middle part 

 is more or less constricted and forms a kind of neck uniting the internal part to the external part. 

 Surrounding the internal part of the organ of fixation there are a great many large and smaller roots. 

 One of these roots has a rather thick wall. It is the proximal part of one of the larger roots. 



In Fig. 8 A the external part of the organ of fixation is visible as a triangular mass next to the body 

 wall of the host. The internal part of the organ of fixation and a great number of roots of various sizes 

 are to be seen in the mass of tissue connecting the ventral nerve cord to the body wall, and in the 



