TREMATODES OF AUSTRALIAN BIRDS. 



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suckers. Cirrus sac mostly in front of ventral sucker, but 

 part dorsal to it. Ooils of the uterus lying between the 

 testes and between the second testis and ovary. Yolk 

 glands of few, large follicles. Eggs 0*038 x 0*024 mm. 



Host. — The boobook owl, Ninox boobook. 



Type specimen in the Australian Museum, No. W. 440. 



A small number of specimens from the boobook owl were 

 given me by my colleague Mr. Launcelot Harrison, who 

 obtained them from the intestine of an owl, secured at 

 Lindfleld, near Sydney. This species is similar in size to 

 It. parvum. The oral sucker, 0*223 mm. in diameter, is 

 smaller than the ventral, 0*262 mm. The testes are broader 

 than long, and the anterior (0*33 mm. broad by 0*25 mm. 

 long) is smaller than the posterior (0*33 mm. broad by 0*29 

 mm. long). The testes are separated from one another and 

 from the ovary behind them by wide coils of uterus. The 

 genital pore lies midway between the two suckers; most 

 of the cirrus sac lies in front of the ventral sucker and the 

 vesicula seminalis is coiled. 



The yolk glands consist of twelve to fourteen large, oval 

 follicles arranged in two rows in the field behind the ovary. 

 The uterus, as usual, is very extensive, obscuring the yolk 

 glands and occupying the whole field of the body posterior 

 to them. The eggs which are light yellow in the proximal 

 part, become dark brown in the distal part of the uterus. 

 They measure 0*038 x 0*024 mm., and are very even in size. 



This species is closely related to L. parvum. Indeed all 

 three species, described here for the first time, are closely 

 related to one another. 



Subfamily HARMOSTOMINiE. 



Harmostomum pulchbllum, sp. n. (Pig. 16.) 



Diagnosis. — Size moderate, body cylindrical and pointed 

 at each end. Spines absent. Oral sucker little larger than 



