ON A NEW CESTODE LARVA PAEASIÏIC IN MAN. 13 



Of tlie seven specimens shown in fig. 2, all from a single 

 cyst, three (perhaps four, a-d) are siraj)le-shaped Plerocercoids, 

 while three others {e-g) are quite irregularly shaped pieces bear- 

 ing each a number of budded heads. All these worms, in my 

 opinion, must have arisen out of a single original Plerocercoid 

 after its encystment. 



Not infrequently the more plump-bodied specimens show on 

 the surface rounded wart-like or papilla-like tubercles which are 

 quite distinct from the buds (figs. 2/, 7, 8, 10, 11, 15). Their 

 formation is due, partly at least, to the accumulation in the 

 parenchyma of a peculiar reserve nutritive matter which will be 

 described further on. The external tubercles, conjointly with 

 the buds, greatly contribute towards giving the worm a remark- 

 able irregular shape (figs. 7, 8), which is sometimes met with, 

 especially among the plump and many-headed — therefore assumably 

 old — pieces of the worm. 



Here a word about the headless and budless pieces (like fig. 

 12) that are segmented off from the hind parts of the Plerocer- 

 coid within the capsule. They are probably not in all cases to 

 be considered as parts thrown off in the manner for exampe of, 

 the caudal appendage of Cysiicercus. Presumably they are still 

 capable of producing buds. At any rate, there is no reason 

 whatever to think that the budding can take place only while 

 the original terminal head is present and not after this is lost 

 by fission. Whether at the end of the proliferation the entire 

 mother-piece would be used up in that process or whether there 

 would finally remain a residue comparable to the vesicular ap- 

 pendage of a Cysticercus, and whether or not the Plerocercoid 

 sheds off the posterior parts before it begins strobilation in the 



