W. Nicoll 
115 
behind the ventral sucker. The testes and ovary are of small size. 
The cirrus-pouch is plump and extends back to near the middle of the 
ventral sucker. The few eggs measure 0’095 to O’100 x 0’05 mm. 
Eehinostomum revolutum (Fruelich). 
This species has already been recorded from North Queensland in 
Anas superciliosa by S. J. Johnston (1913). I have found it again in 
the same host as well as in the magpie goose ( Anseranas semipalmata) 
and the black swan ( Chenopsis atrata). A single specimen was also 
taken from the intestine of the green goose teal ( Nettopus pulchellus). 
Patagifer bilobus (Rod.). 
An additional Australian host of this parasite is the straw-necked 
ibis ( Carphibis spinicollis) from the intestine of which half a dozen 
specimens were collected. 
Sub-Family Echinochasminae. 
Eehinochasmus prosthovitellatus n. sp. 
(Plate VII, fig. 7.) 
A considerable number of specimens of this peculiar Echinostome 
were obtained from near the posterior end of the intestine of a brown 
hawk ( Hieracidea orientalis). It is a small plump form measuring 
2 to 2’4 mm. in length. It is broadest in its posterior third where it 
may attain a breadth of 0’75 to 0’9 mm. The tail is acutely pointed. 
The breadth of the head is almost constantly 028 mm. The thickness 
of the posterior part of the body is about half the width, but the neck 
is more flattened and slightly hollowed out ventrally. 
The cephalic spines number 24 and measure 005 to 0’055 mm. in 
length. The row of spines is not continuous dorsally but is inter¬ 
rupted by a median dorsal space measuring 0’077 mm. in breadth. The 
whole of the body, both dorsally and ventrally, is beset with large power¬ 
ful spines which extend right to the tip of the tail. 
The oral sucker measures O’11 to O’14 mm. and the ventral 0’38 to 
0’45 mm., the rate being 3:10. Both suckers are globular. The 
ventral sucker is situated at a distance of 0’65 to 0’92 mm. ( i.e . ap¬ 
proximately three-eighths of the body length) from the anterior end. 
The pharynx is somewhat larger than the oral sucker and measures 
on an average 0T5 x 0'13 mm. There is a short prepharynx. The 
