338 ON SOMK TREMATODK PARASITRS OF AUSTRALIAN FROHS, 



it. While there is by no means unanimity*(57, 58, 60, 98) in 

 placing crassicoUe in the genus /irachyccelium as its generic 

 type, though I do not know the worm from my own personal 

 observation, I feel compelled to follow Stiles and Hassall (95), 

 Looss(55), Stafford (91), and others, in regarding it as the 

 type of Brachycmliuni. 



Tjiihe, in discussing the relationships of his Distomnm sociale, 

 says (Zwei neue Distomen aus indischen Anuren, p.l73) : " Es 

 kann keinein Zweifel unterliegen, dass die vorstehend beschrie- 

 bene Art mit Disfomum mutahile und mit den Dicrocoelien nahe 



verwandt ist In der That zeigt Distomnm sociale 



ausser zu Disfomum viutahih' und den Dicrocoelien auch zu den 

 Lecithodendrien, speziell, zu Lfcithodendrinm crassicoUe, ziemlich 

 nahe \erwandtsehaft]iche Beziehungen. Die Unterschiede des 

 Distomnm sociale aus dem Diinndarme der indischen Krote 

 gegeniiber dem im Diinndarme einheimischer Amphibien 

 schmarotzenden Lecithodendrinm crassicoUe bestehen im wesent- 

 lichen in dei' ei-heblich grosseren Lange der Darmschenkel, der 

 Lage des Keiiustockes hinter den Hoden und dem TJmstande, 

 dass wie die Darmschenkel, so auch die Dotterstoeke weiter nach 

 hinten reichen." 



The /Jicrocoiliitut (Looss, 50) are a subfamily certainly not 

 very distantly related to the Brac/ii/coiliuKe, the main points 

 of difference being in the excretory vesicle, tubular in the 

 former, V-shaped in the latter : in the length of the intestinal 

 limbs, long in the former, very short in the latter : in the 

 invariable presence of copulatory organs in the former, 

 while they are sometimes absent in the latter ; in the position 

 of the gonads, and the position and extension of the yolk- 

 gland ; and in the larger size of the eggs in the former. Of 

 all the Brachycoeliinae, the various species of Mesocalinm 

 appear to approach more closely to the Dicrocceliinae than any 

 others of their subfamily, with their practically tubular ex- 



* I have noticed later that Liihe in his " Handbook of Practical Parasi- 

 tology(l9l0)," written in collaboration with Braun, accepts Brachycaliant 

 ci-dssirol/f (p. 180, Knglish edition), where a (ilear figure of the woroi ia 

 given. 



