ELLOBIOPSIDAE 291 



the parasite. In the sections the ovary does not appear to be degenerated, though the eggs have 

 remained comparatively small. 



A section of the lower part of the organ of fixation of the same specimen is shown in Fig. qb (p. 299). 

 The cuticle of the organ of fixation in many parts is rather strongly wrinkled. The sieve plate is more or 

 less convex, and contains a great number of openings. Irregular protoplasmatic excrescences are 

 protruding through the sieve plate; in some parts these excrescences themselves are covered with 

 a cuticle. 



(2) Specimen on E. vallentini from St. WS 770 (PI. XXXIX). The section gives a distinct view of the 

 various parts of the parasite. The organ of fixation is more or less panduriform, as its ovoid internal 

 part is connected by a rather narrow neck to the again broadening external part. From the latter the 

 basal parts of a number of trophomeres take their origin. The section shows several groups of gonomeres 



Fig. 2. Amallocystis fagd Boschma on Eiiphausia vallentini Stebbing from St. 892. Transverse sections 



anterior region than b. Letters as in Fig. i. x 80. 



of host, a from a more 



spreading in all directions. At the underside of the organ of fixation the sieve plate is visible ; through 

 this plate some protoplasmatic excrescences often of considerable length are seen to protrude into the 

 ovary of the host. In this specimen again the ovary shows no obvious signs of degeneration. The 

 developing eggs seem to be of normal appearance. 



(3) Specimen on E. vallentini from St. 892 (Fig. 2). The chief details of two sections, separated by 

 a distance of 40//, are given in the figure. One section (b) shows the rather narrow neck connecting 

 the internal and the external parts of the organ of fixation. The external part at its top divides into 

 trophomeres which extend in various directions. The lower part of the organ of fixation shows a large 

 sieve plate through which protoplasmatic excrescences are seen to protrude into the ovary of the host. 

 At its sides the internal part of the organ of fixation is surrounded by masses of chitin. The other section 

 {a) is from a slightly more anterior part of the host. Here the sieve plate is still visible, on one side 

 of the parasite. 



(4) Specimen on E.frigida from St. 766 (Fig. 3 a). Here again there is a distinct constriction between 

 the external and the internal parts of the organ of fixation. The cuticle of the internal part is rather 

 strongly wrinkled, and the sieve plate is found on one side of the parasite. Sections of two trophomeres 

 and of one gonomere are to be seen. 



