TREMATODES OF AUSTRALIAN BIRDS. 239 



Family MONOSTOMIDiE. 



Cycloccelum taxorchis, sp. n. (Fig. 23.) 



Diagnosis. — Middle sized worms, widest a little behind 

 the middle, gradually narrowed towards the anterior end, 

 and widely rounded behind. Pharynx small, oesophagus 

 long. Genital pore at posterior end of pharynx. Cirrus 

 sac long, reaching the intestinal limbs. Testes side by 

 side, one on either side of the middle line, equal in size. 

 Fields of the yolk-glands extend forwards as far as the 

 pharynx, separated in the posterior end by a distinct in- 

 terval. Coils of the uterus only in one or two exceptional 

 cases reach beyond the inner edge of the intestinal limbs. 



Host. — Limosa novce-hollandice, in the body cavity. 



Type specimen in the Australian Museum, Sydney, No. 

 W. 444. 



Ten specimens of this species were obtained from the 

 body cavity of the Godwit, Limosa novce-hollandice, by Dr. 

 Harvey Johnston, at Lord Howe Island. They are moder- 

 ate in size, varying from 8 to 14 mm. in length, and 2*28 to 

 3*53 mm. in breadth. The cuticle is raised up into a num- 

 ber of prominent ridges arranged in the form of a network, 

 so that a section near and parallel to the surface has the 

 appearance shown in fig. 23a. The body is flat dorsoven- 

 trally, widest a little behind the middle, gradually reduced 

 to a blunt rounded point at the anterior end, while the 

 posterior extremity ends in a broad, round sweep. 



The mouth opening is terminal; the oral cavity funnel- 

 shaped ; and the pharynx small 0*25 mm. long by 0*192 mm. 

 broad. The oesophagus is comparatively long, 0*6 mm. The 

 intestinal limbs pass back in a somewhat wavy course 

 parallel to the lateral and posterior edges of the body. The 

 excretory vesicle, almost at the pore, divides into two 

 widely separated branches. 



