8 ART. 7. 1. IJIMA. 



as would eifectually assist the worm in penetrating into and 

 shifting through tlie tissues of the host. In several cases I have 

 succeeded in killing the worms with the head completely or 

 nearly completely everted and protruded, by suddenly pouring on 

 hot corrosive sublimate (figs. 18, 21). 



The broad posterior parts of the body showed at most slow 

 vermiform movements, keeping up nearly all the time a more or 

 less strong indentation or invagination at the extreme hind end. 

 Attempts to bring fresh worms into full extension by applying 

 pressure between glasses, invariably failed. 



From what I have seen of the moving head I must say 

 that this is entirely destitute of any definitely formed and per- 

 manent organ of attachment. Examinations of well extended 

 heads laid out into serial cross-sections have failed to reveal 

 anything like bothria or suctorial grooves characteristic of the 

 Bothriocephalidse. It can certainly not be denied that the ter- 

 minal invagination, an inconstant and temporary condition though 

 it be, may under circumstances play the part of a sucker. 



Division of the Worm tvithin the C(ti)sule» — With the 

 smaller capsules it is the rule that they contain each a single 

 worm. The same may sometimes be the case with the larger 

 capsules also, but these more frequently contain two or more 

 worms or pieces of the worm. From one of the largest capsules 

 I have seen, five worms were obtained, and in another case seven 

 (fig. 2). This increase in number is explained by the propensity 

 of the worm to divide by transverse fission at a certain stage of 

 its growth. Very frequently the worm body shows a constriction 

 or constrictions at which places it is easily torn apart. In many 

 cases I could not prevent this separation of the body taking place 



