308 ON SOME TREMATODE PARASITES OF AUSTRALIAN FROGS, 



body) larger suckers, while the ratio of the diameter of the 

 suckers is different in the two species. In this species, too, 

 the ovary is pear-shaped, and the follicles of the yolk-glands 

 (009 X 007) are much smaller than in D. megalochrus. The 

 eggs, too, differ in shape from those of the last-named species, 

 being shorter and broader. 



These two species are pretty closely related in their struc- 

 ture to their European representative, D. Subdavatus R., 

 and somewhat less closely to the American 1). tewperatus 

 Staff. They differ from the former in the more marked de- 

 velopment of the oral diverticula, in the shorter intestinal 

 limbs, in the postion of the ovary in regard to the testis 

 (according to Looss' figure in 46), and in the more posterior 

 position of the excretory pore, as well as in the details of 

 the arrangement of the collecting tubes of the excretory 

 system. They differ from the American species in their much 

 shorter intestinal limbs, in the testis being single, while 

 there are two in D. temperatus: in the lateral position of the 

 ovary rather than median, as in D. temperatiis(9l , p.689), and in 

 the yolk-glands extending much further anteriorly. 



These two Australian species, perhaps, ought to be placed 

 in a separate genus, but I do not feel myself sufficiently 

 familiar with the anatomy of related worms of this group 

 (the published descriptions in most cases not going far 

 enough) to make the attempt at present. 



Literature referred to— 4. 15,16, 17, 19, 46, 55, 61, 63. 91. 



Genus DoLiCHOSACcus, gen.nov. 



Subfamily Plagiorchinse Luhe, (Lepodermatinae Looss). 



(Figures 4-8,43-50.) 



DiaynosiH. — Small, elongated worms of somewhat flattened, 

 oval cross-section, about 3 mm. long, a little narrowed in 

 front and behind, and rounded off at the ends. Integument 

 spiny ; suckers well-developed, not far apai't. Pre-pharynx, 



* SoA.i;^o?, long ; craKKOS, a sac, referring to the cirrus-sac. 



