BY GERARD KREFFT, ESQ., F.L.S. 217 



was noticed only in one fragment, (Plate T., fig. Ic, nat. size) and 

 its shape may be accounted for, because the ovum was obtained 

 from a very anterior segment ; no hooks were seen in it. The 

 present species seldom exceeds 18 inches in length, shorter 

 specimens are, however, of more frequent occurrence. Owing to 

 the leniniscy being long, tapering, and often well thrust out, the 

 sides of a colony appear quite fringed ; it is also a curious fact 

 that many of the segments are provided with these organs 

 almost to the very first one. This peculiarity is not shown on 

 Plate I., fig. 1 , because I had not noticed it when the sketch was 

 made on account of the lemnisci laying close to the joint, I found, 

 however, afterwards that they always reach right up the sides of 

 the neck, and can be seen with a lens. The joints of the colony 

 are regular and very closely packed for the first inch or two, the 

 last being generally wide and thick. The anterior part in some 

 specimens is very thick also. 



Fig. 18 of Plate I. is an enlarged representation of the 

 anterior part of one of the examples which is surmounted by a 

 pennant-like filament. All the specimens obtained were found 

 , in the Little Grebe (Podiceps cmstralis) . 



TjENIA paradoxa. 

 (Plate III., figs. 18, 19, 20, 21, 21a, 2lh, 22, 22a, and 23). 



General form like Tsenia novse-hollandiae, segments smooth, 

 lemnisci absent. The head is sometimes surmounted by a short 

 proboscis rising between four small distinctly margined suckers 

 or pores, (Plate III., fig. 18.) In other specimens the proboscis 

 is not visible (Plate III., figs. 19 and 20.) At first sight I have 

 often confounded this one with the species which inhabits the 

 intestines of the Little Grebe (^Podiceps avstralis), but as the ova 

 difier much in both, I have no doubt that it is distinct. 



The ova are round, in fact perfectly circular, covering an oval 

 or half oval body with (in the latter case) a produced smaller 

 half circle in the middle of the less rounded side, (Plate III., 

 figs. 22, 22a., and 23.) The hooks are distributed alike in both 

 varieties. The two middle ones vertically and each outer pair 

 in a horizontal position. 



