234 S. J. JOHNSTON. 



This species of Clinostomum seems to be more closely 

 related to C. marginatum^ than to any other species. 

 They are fairly similar in external form but the Australian 

 species is larger, and the ventral sucker is relatively further 

 forward in the body. The position of the cirrus sac is 

 different, being alongside the anterior testis, and not at all 

 in front of it. The cirrus of 0. marginatum does not appear 

 to be spiay since Osborn makes no mention of this feature. 



C. australiense differs from 0. hornum, Nicoll (39) in size 

 and shape, in the position of the genital pore (it is removed 

 from the middle line in the latter) in having the ventral 

 sucker nearer the anterior end and in having side branches 

 to the intestinal limbs. 



Family BILHARZIIDiE Odhner, (SCHISTOSOMIDiE). 



AUSTROBILHARZIA TERRIGALENSIS, gen. et Sp. nOV. 



(Pigs. 18-22.) 

 Diagnosis. — Male shorter than the female, the gyneco- 

 phoral canal extending from the hinder border of the ventral 

 sucker to the posterior end of the body. Suckers well 

 developed and prominent. (Esophagus ending at or a little 

 in front of the ventral sucker; the paired intestinal limbs 

 running backwards without any connecting commissure to 

 the last quarter of the body where four commissures occur r 

 followed by a short, terminal, unpaired section of gut. 



Testes consisting of about eighteen to tiventy rounded 

 follicles lying one behind the other, symmetrically placed 

 between the intestinal limbs, beginning anteriorly a little 

 behind the ventral sucker and extending backwards to the 

 middle of the body. Genital pore situated towards the left 

 side a little behind the ventral sucker. Cirrus sac present, 

 enclosing the vesicula seminalis: prostate present. 



Female considerably longer than the male, the anterior 

 part rounded and thread-like, the posterior part, in which 

 the ovary and yolk glands lie, flattened and much broader. 



