TREMATODES OF AUSTRALIAN BIRDS. 



223 



two species; in L. howensis the male bursa copulatrix is 

 considerably smaller. The eggs also are a good deal smaller 

 in the Australian form. 



Subfamily DICROCCELIINiE. 



Lyperosomum parvum, sp. n. (Fig. 14.) 



Diagnosis. — Elongated, cylindrical; suckers large, oral 

 rather smaller than the ventral, oesophagus short; intestinal 

 limbs reaching posterior end. Testes placed close together 

 and just behind the ventral sucker. Genital opening in 

 front of, but close to the ventral sucker; cirrus sac lying 

 mainly dorsal to the ventral sucker; vesicula seminalis 

 much coiled. Ovary behind and close to the posterior 

 sucker. Yolk glands consisting of a feiv large follicles in 

 two rows behind the ovary. Uterus very extensive. Eggs 

 thick shelled, 0*039 x 0*023 mm. 



Host. — Strepera versicolor, in the intestine. 



Type specimen in the Australian Museum, No. W. 438. 



This species is represented by a number of small trem- 

 atodes collected at Rydal, New South Wales, by my friend 

 Dr. S. J. H. Moreau, from the intestine of the grey crow- 

 shrike, Strepera versicolor. 



This species is much smaller than any Lyperosomum 

 hitherto described, having a length of 3*6 mm., and breadth 

 of 0*37 mm. The body is almost cylindrical, but only 

 slightly flattened towards the posterior end. The suckers 

 are rather longer than broad, the oral (0*213 x 0*194 mm.) 

 being smaller than the ventral (0*252 x 0*233 mm.). The 

 pharynx, broader than long (0*054 x 0*08 mm.), is very 

 much smaller than the suckers. There is a short oesophagus, 

 ending a little in front of the ventral sucker, and the two 

 intestinal limbs, which are narrow and unbranched, run 

 back to the posterior end of the body. The genital opening 

 is situated in the middle line in front of, and close to the 



