12 ART. 7. — I. IJIMA. 



separate off from that body part with which they were originally 

 continuous and may thus represent in themselves new independent 

 individuals of the typical, though at first comparatively small, 

 Plerocercoid shape. In this way can be explained the origin of 

 the two or more Plerocercoids, occasionally found together in the 

 same capsule. 



Division alone or in combination with budding gives rise to 

 various shapes of the worm-pieces which in various combinations 

 may occur together in the same sapsule. To give a few illustra- 

 tions from a number of cases observed : 



On several occasions a typical Plerocercoid with head was 

 found together with a plump, nearly cylindrical and headless 

 piece or with two such pieces (like fig. 9 or 12). All the two 

 or three pieces must have been derived by division from an origi- 

 nal Plerocercoid that at first singly occupied the capsule. In 

 these cases the division of body had evidently taken place before 

 the worm had commenced budding. 



From a large cyst were once obtained : a Plerocercoid with 

 a supernumerary head on one side and looking very much like 

 fig. 4 and two nearly barrel-shaped headless pieces (like fig. 12), 

 both of which must have originally been continuous with the 

 hind end of the first. 



Another large cyst gave two small Plerocercoids of typical 

 appearance and a large apparently headless body (like fig. 9). One 

 of the former I take to be original Plerocercoid head and the 

 other, an individual which has been budded off. 



The specimen of fig. 5, bearing two buds and showing a 

 strong constriction in the middle, was the sole occupant of a cyst. 

 Should that constriction give way, what the result would be needs 

 no explicit mention. 



