116 AUSTRALIAN ENTOZOA, III. 



Plate vii. 

 Holostomum simplex (figs. 1-3). 



Fig. 1. — Longitudinal section; not passing through the mouth of the cup 



(x50). 

 Fig. 2. — Drawing of the whole worm, mounted ( x 28). 

 Fig. 3. — Transverse section through anterior body-region showing the simple 



folded clinging apparatus ( x 50). 



Holostomum musculosum (figs, 4-9). 



Fig. 4. — Transverse section through anterior end of cup ( x 37). 



Fig. 5. — Transverse section through cup, further back than fig. 4 ( x 37). 



Fig. 6.— Transverse section through posterior body-region showing bands of 



longitudinal muscle ( x 20). 

 Fig. 7. — Transverse section through bursa and split genital papilla ( x 20). 

 Fig. 8. —Transverse section through posterior body-region, much farther 



forward than that of fig. 6, showing excretory vessels and 



muscular bands ( x 20). 

 Fig. 9. — Sketch of an unmounted specimen of Holostomum musculosum : 1, 



opening of cup; 2, projecting part of clinging plug; 3, digitate 



processes of clinging plug ( x 12). 



