298 



DISCOVERY REPORTS 



ventral nerve cord itself. A few of the roots which have just branched off from the organ of fixation 

 have a rather strong wall, drawn with a double line in the figure. The internal part of the organ of 

 fixation in this section shows the proximal parts of some large roots (in the upper and in the lower 

 parts). Moreover, in the organ of fixation there is a series of cuticular formations which undoubtedly 

 represent a sieve plate. In the section there is a series of small cuticular bars arranged in a crescentic 

 row. Inside and outside this row there are a few more of these cuticular formations, so that the sieve 

 plate is not as distinct as in Amallocystis fagei. More details of this sieve plate will be noted below. 



Fig. 8 g-j. For explanation see Fig. 8a~/. In addition: s, sieve plate. X45. 



In the section of Fig. 8 /the ventral nerve cord is no longer connected with the mass of tissue enveloping 

 the parasite. In the nerve cord itself there are still a few roots. The internal part of the organ of fixation 

 shows one root penetrating into the musculature of the body wall (in the left half of the figure). More- 

 over, there is one large root in the upper part of the organ of fixation. This root is partially separated 

 from the organ of fixation by a sufficiently distinct sieve plate. On the wall of the organ of fixation 

 there are numerous more or less irregular cuticular excrescences, and in the interior of this organ there 

 are a few irregular masses of cuticular matter, the whole forming a part of, or being connected with, the 

 sieve plate of the section in Fig. 8 A. 



The last section represented here (Fig. 87) shows parts of the root system, in the ventral nerve cord 

 as well as in the musculature of the body wall. Especially in the latter there are a great number of roots. 



The internal part of the organ of fixation, as it appears in the section preceding that in Fig. 8 A, is 

 drawn on a larger scale in Fig. 9a. The organ of fixation is covered with a comparatively thick cuticle, 

 which is also present on the thick roots extending from the organ of fixation. In the lower part of the 

 figure there are more or less irregular excrescences of the cuticle which protrude as a trabecular mass 

 into the organ of fixation. This trabecular mass is arranged in a more or less crescentic manner, 



