244 S. J. JOHNSTON. 



reach a size of 0*241 x 0*107 mm., while those of H. con- 

 similis, Nicoll, (39,p,125) do not exceed 0*2 x 0*08 mm., and 

 those of JT. similis, Stoss., 0*202 x 0*083 mm. (Dietz, ***■");, 



Hyptiasmus magnus, sp. n. (Fig. 25.) 



Diagnosis. — Large worms, with an elongated, flattened 

 body, widest towards the posterior end. Intestinal limbs 

 separated from the lateral edges of the body by a wide 

 interval. Half the cirrus sac lying behind the fork of the 

 intestiDe. Testes very large. Three gonads close together. 

 Lateral fields of the yolk glands not continuous with one 

 another behind the commissural part of the intestinal limbs. 

 Loops of the uterus not extending back behind the anterior 

 border of the posterior testis. 



Host. — Chenopsis atrata, in the pharynx. 



Type specimen in the Australian Museum, Sydney, No. 

 W. 446. 



Two specimens of this large fluke were obtained from the 

 pharynx of the Black Swan, Chenopsis atrata, in Victoria, 

 by Mr. A. Le Souef, Director of the Zoological Gardens at 

 Sydney. The length of these specimens is 19 mm., and the 

 breadth 4*5 mm. at the widest part in the region of the 

 anterior testis. It tapers fairly gradually to a blunt point 

 in front, but is rounded behind. The integument is made 

 rough by a number of transverse ridges of thickened cuticle 

 that cross the body transversely. The mouth cavity is 

 funnel-shaped, 0*388 mm. long. Between this and the 

 pharynx is interposed a distinct prepharynx 0*29 mm. long. 

 The pharynx is 0*349 mm., and the oesophagus 0*582 mm. 

 long. The large cerebral ganglia lie at the anterior end 

 of the prepharynx, just at its junction with tbe mouth 

 cavity. The intestinal limbs which are wide, run about 

 halfway between the middle line of the body and the lateral 

 edges, bending inwards a little between the testes. 



