BY S. J. JOHNSTON. 1 1 1 



(PI. vi., figs. 1-5). The cushion-like part of the plug is grooved in 

 the mesial line by the deep longitudinal incision characteristic of 

 this part in many species of the genus, which almost divides it 

 into two, and does completel}^ divide it in its anterior aspect, and 

 each of these divisions, projecting for some distance beyond the 

 rim of the cup, ends in a knobby club-shaped head. 



The oral and ventral suckers are about the same size (013 mm.); 

 the pharynx is a little smaller (0-08 mm.). A short oesophagus 

 follows on the pharynx; the two limbs of the intestine, lined by 

 a single laj^er of large deeply-staining cells, are continued to the 

 extreme posterior end of the body (Pl.vi., fig 8). The excretory 

 system of vessels is well developed. 



The ovary is a rounded, solid body, situated dorsally about the 

 middle of the posterior body-region. The uterus runs forward 

 almost to the junction of the anterior and posterior body-regions, 

 and, in those specimens in which it is filled with eggs, occupies 

 the greater part of the body-space. The testes are oval, solid 

 organs, lying one behind the other just behind the ovary. 



The vitelline glands do not extend into the anterior body- 

 region, but extend throughout the whole length of the posterior 

 body-region, surrounding the other organs. 



The vesicula seminalis is large and coiled, and leads into a duct 

 which opens into the female duct just before that duct opens on 

 the extremity of the genital papilla. 



The bursa copulatrix is very large, larger than the anterior 

 body-region. A strong sphincter muscle surrounds the orifice of 

 the bursa; and less strong sphincter muscles are present in the 

 base of the bursa near its junction with the rest of the body, 

 and also at the base of the genital papilla. A well marked cir- 

 cular muscle is present throughout the length of the genital 

 papilla, and strong longitudinal fibres are seen in both the papilla 

 and walls of the bursa. 



Found in the duodenum of the Australian Gull, Larus novce- 

 hoUandice, Stephens. There is just the bare possibility of doubt 

 about the specific identity of this host. Collected at Jervis Bay. 



