324 ON SOMK TREMATODK PARASITKS OF AUSTRALIAN FROGS, 



intestinal limbs, it proceeds forwards to the genital chamber. 

 Both the descending and ascending median loops pass between 

 the ovary and the anterior testes, and between the two testes, 

 and the uterus lies, for the most part, near the ventral sur- 

 face of the body. 



The yolk-glands consist of a large number of oval follicles, 

 about 0-085 x 005 mm. in size, placed close to the dorsal 

 surface (Figs. 59, 60). Their arrangement into groups is 

 characteristic. A pair of anterior patches extend forwards 

 as far as the fork of the intestine, and from the lateral mar- 

 gin inwards nearly to the middle line(Fig. 56), and backwards 

 as far as the ventral sucker. Each patch is made up of four 

 01 five groups of 14 or 15 follicles each. The common duct 

 of each group joins the main anterior lateral duct on each 

 side. Each pair of posterior patches consists each of six 

 groups of follicles, each group containing 12-15 follicles: they 

 are more laterally confined than the anterior patches, and 

 only pass inwards beyond the inner border of the intestinal 

 limbs at their extreme posterior end, and that generally only 

 on one side (Fig. 56). These posterior patches extend from 

 behind the ovary, almost to the ends of thr intestinal limbs 

 (Fig. 56). The common ducts of each group join a posterior 

 lateral duct on each side. The anterior and posterior lateral 

 ducts meet about the middle of the body, to form right and 

 left traUvSverse ducts which unite, near the middle line, to 

 form the final part of the diict that opens into the ootype. 



The er/fjK are ertrnorrlinarily niiwprniia, very uniform in 

 size, and very small, 0-02 x 0014 mm. 



This species of worm occurs in the lungs of TI i/hi (uirea and 

 lAmnodynni^fcif pernnii, and these are the only frogs in which 

 I have found trematodes in the lungs. These lung-fliikes do 

 not appear to l)e so common in Australian frogs as they are in 

 European (Hollack, 33), and American frogs (StaflTord, 8f^). 

 nor, when they do occur, are they present in such large num- 

 bers. T have never found more than 10 in one frog, and, as 

 a rule, only one, two or three are found. Only two of my 



