56 ENTOZOA OF MONTREMATA, ETC., 11., 



anterior iDortion, becomes filled by it, as it soon conies to 

 extend from the excretory vessels of the one side to those of 

 the other. Some of the processes from the walls penetrate 

 deeply into the cavity, so that the whole organ appears to be 

 made up of a large number of chambers opening into the 

 main, transversely lying portion. In such segments, the male 

 and female ducts still persist, though they are pushed far 

 forwards ; the testes, though present, are partly atrophied : 

 whilst, of the female glands, the vitellariuni, which lies near 

 the middle of the posterior margin of the proglottid, is the 

 only part recognisable. Ripe eggs were not present, but 

 immature eggs measured 0011 mm. in diameter, the embr/o 

 being 0-006 by 0004 mm. 



Systematic Position. — This parasite of the black wallaby is 

 of considerable interest, as it is the first, armed, adult ces- 

 tode to be described from a marsupial. All the tapeworms 

 so far known from the Aplacentalia of Australia and the 

 East Indies, belong to the Ano-pJocephalinae, a fact already 

 emphasised by Zschokke (1899). The parasite under review 

 approaches very nearly to the genera Cliodiiofceiiia, Moiiop;/- 

 Vidium and Anomotwnia, but possesses characters which seem 

 to me to be of sufficient importance to justify the erection of a 

 new genus, Bancroft wlla, for its reception, the generic name 

 being given in honour of Drs. J. and T. L. Bancroft, of 

 Queensland, who were the pioneers of Australian parasitology. 

 The following may serve as a generic diagnosis : — 



Dipylidiinas (of .Stiles = Dilepinjt- of Fuhrmann) ; rostellum 

 armed with two rows of hooks ; genital pores irregularly 

 alternating ; genital ducts passing between the excretory 

 canals ; testes numerous, arranged in two fields, an anterior 

 and a posterior, separated by the female complex ; uterus 

 saclike with numerous septa projecting into and dividing up 

 the cavity. 



Type-species Bancroftiflht teiiin.<, n.sp., from Macro pun 

 itahthatiis, the type-specimen being deposited in the Aus- 

 tralian Mviseum, Sydney. This genus differs from the three 



