222 ON AUSTRALIAN ENTOZOA, 



dots became visible near the middle of the more posterior 

 segments, but always more ou one side than on the other. 

 These dots increase iu size as the joints approach the end. No 

 lemuisci have been observed, though many discharged ova were 

 noticed in all directions, some on the side of the head and others 

 on the corners of various joints, (Plate II., figs. 7 and 7a). 



Habitat, the intestines of the common Phalanger, (Flmlangista 

 vulpina.) 



T^NIA PEDIFORMIS. 



(Plate IL, figs. 2, 2a, 26, and 2c). 



The present species resembles the Hammer-headed Tape 

 Worm of Rudolphi, figured by Bremser, (Icones Helminthum, 

 Plate XV., fig. 17, 18, and 19), and like its European representa- 

 tive inhabits the intestines of various ducks, in this country. Our 

 species are rather larger than the European ones, and more 

 elegant in form, the hammer or foot-like frill is completely 

 articulated, and in very young specimens this part is perfectly 

 erect. It is only when the joints have reached the adult 

 stage, that the " head " or rather the head and neck combined 

 assume the horizontal position with which Helminthologists are 

 most familiar. For the head proper (the first joint or agamozooid) 

 I have looked in vain, and only in one or two instances did I 

 observe two slight sucker-like depressions on the very tip of the 

 thinnest part of the " hammer." 



My best and largest specimen was seven inches in length, and 

 occasionally one-eighth of an inch wide ; the hammer-shaped 

 combination of head and neck measuring three-eighths of an inch 

 from one extremity to the other. In young specimens the whole, 

 in adults only two-thirds of the appendage, shows articulations, 

 the remaining or lower portions being granular. The joints are 

 very irregular, and occasionally a few indistinct divisional lines 

 appear, but they can never be traced with certainty. There is 

 no sign of any lemnisci, and the edges of the greater portion of 

 the colony are crowded with ova, which during the drying 

 process were copiously discharged. I was unable at the time to 

 sketch them. This species inhabits the intestines of the Black 

 Duck {A7ias supercilioscC) , and the Teal {^Anaa punctata?). 



