7(5 W. N. F. WOODLAND 



the worm becomes much more coiled mside the capsule, ^ and 

 at some period escapes from the capsule. Judging from the 

 widely different sizes, both of masses lying free in the body- 

 cavity and of the active Amphilina, the differentiated masses 

 nmst escape from their capsules at very different stages of 

 growth. It must be understood that although I have only 

 figured a few of the stages of development of these masses, 

 yet all stages transitional between the youngest and the oldest 

 can be observed in sections through infected mesentery. It 

 is evidently umiecessary to give figures of the entire series. 



Two other kinds of encapsulated masses must be described. In 

 two of the largest amorphous masses (PI. 3, fig. 2, e, represents 

 one of these masses) I found enclosed in each a histologically 

 well-developed Amphilina of large size and considerable 

 length, the body being tightly coiled on account of the restricted 

 space. Many of the tissues of these encapsulated Amphilina 

 were well differentiated and especially the reproductive system, 

 the uterus being of large size and, to my great surprise, full 

 of large oval flat larvae with their charac- 

 teristic booklets and equal in size to the similarly shaped 

 larvae in the uterus of the 280 mm. active Amphilina described 

 in Part I. The larvae, however, were very degenerate (in 

 most cases largely disintegrated) and were only recognizable 

 as larvae on account of their location, general shape, and the 

 characteristic booklets. The only hypothesis which I can sug- 

 gest to account for these facts is that for some reason the 

 amorphous mass in this instance had been unable to escape 

 from its capsule, and being compelled to undergo its develop- 

 ment inside the capsule, this development was both incomplete 

 (e.g. the proboscis was not developed) and one-sided, the 

 reproductive organs developing at the expense of other organs. 

 The larvae being formed and unable to escape, naturally 

 degenerated. Certain appearances suggest to me that in 

 places the substance of the worm was being invaded by histo- 

 lytic tissue derived from the walls of the capsule. 



^ Salcnsky states that he once found a young A. foliacea contained 

 in a capsule on the peritoneum covering the liver of the (Sterlet. 



