220 ON AUSTRALIAN ENTOZOA/ 



T^NIA CTLINDRICA. 



(Plate II., figs. 6 and 6a). 



The head is a little less in size than the broadest pro- 

 glottis, much produced beyond the neck, subquadrangular with 

 rounded corners, and with four margined suckers and a tuber- 

 cular proboscis in the middle. The body consists of closely 

 packed joints not flattened out but perfectly cylindrical ; only 

 the posterior segments are slightly larger than the others. The 

 beautiful yellow color so prominent in the allied species described 

 before has not been noticed in this one, nor can any lemnisci be 

 traced. 



Habitat : the intestines of the Black Duck (^Anas superciliosa). 

 Total length half an inch, and one sixteenth of an inch wide. 

 I have noticed a few much smaller specimens in which the head 

 was as large as the whole body, but as I could not see any differ- 

 ence except in size, I have arranged them provisionally with the 

 present species. 



T^NIA CORONATA. 



(Plate I., figs. 7 and 8). 



Head produced beyond the neck, crown-shaped, with four 

 large disks and a small proboscis. The neck forms one-fourth of 

 the total length at which distance the joints begin to increase in 

 size, the last, which is three lines in width, being the largest. 

 The lines between the segments are undulated, and appear to be 

 divided into two or three ridges or elongate tubercles with some- 

 times an additional one near the openings for the lemnisci, which 

 are regular and double. Their situation is the upper corner of 

 each proglottis, they are surrounded by a raised line and scarcely 

 protrude, so that they ai*e easily overlooked. The lower portion 

 of each joint bulges out and overshadows the lemniscus of 

 the next one. 



Total length three inches and a half, of which about one inch 

 forms the thinner part of the neck. The proglottides are rather 

 wide in a vertical direction, that is in proportion to the size of 

 the colony ; in the middle I counted 12 segments covering a dis- 



