22 DR. F. E. BEDDARD ON 



of the increased shell. Text-figure 6 (p. 21) shows a clump of 

 eggs in transverse section within a compartment of the iiterus, 

 pressed to whose boundary walls on either side is a testis. 

 This figure may be compared with text-figure 3 (p. 13), which 

 illustrates a corresponding view of an egg-clump in Ichthyotcenia 

 nilotica. 



The masses of eggs of Ichthyotcenia varia are, however, some- 

 times rather different from that represented in the drawing to 

 which attention has just been called. Occasionally (as shown in 

 text-figs. 6, 7) each mass of eggs is surrounded by a common 



Text-fig. 7. 



Two isolated masses of embrj'os from the uterus of Tclitliyotcenia {Acantliotcenia) 

 varia, viewed entire as transparent objects, to show the sheath whicli encloses 

 a variable number of embryos. 



sheath or shell, within which lie the eggs, or rather embryos, each 

 with its own shell. The same state of affairs is quite plainly visible 

 in preparations of a proglottid mounted entire (test-fig. 5) in 

 glycerine, where the eggs appear to be contained within a glass 

 ball. In the text-figure to which I have referred the outer sheath 

 is represented as thin ; it is often considerably thicker, and I 

 have seen it with a few thin obliquely-set spiny processes. An 

 aggregation of the eggs within the uterus appears also to occur 

 in Ichthyotcenia saccifera of v. Ratz, but there are not sufficient 

 details given to compare with the conditions observed by me in 

 I. varia. As to the egg-masses enclosed within a common sheath, 

 they suggest spores within a sporangium, and give rise to the 

 idea (which I admit to be otherwise unsupported) of the division 



