16 DR. T. S. COBBOLd's STNOPSIS OF THE DISTOMID.E. 



Leidy, Moulinie, Cobbold, Pagenstecher, Wagener, Diesing, Revis. 



der Myzelmintli. p. 30. 

 D. Hylce, Rudolphi. 



In statu larvae. 

 C {Xiphidlocercaria) macrocerca, Filippi, Diesing, Revis. der Cerearien, 



p. 19. 



C. {Acanthocephala) macrocerca, Filippi, Diesing, Revis. der Myzel- 

 minth. p. 30. 



Hab. This fluke is abundant in Frogs. Its development has recently 

 been investigated with great success by Wagener and Pagenstecher. 

 The adult form was originally discovered in Rana esculenta by Losche, 

 Zeder, Rudolphi, and Pagenstecher. It has also been found in R. 

 temporaria by Mehlis, myself, and others ; in Bombinator igneus by 

 Gade ; in Dendrohyas viridis ; also in America, by Leidy, in Rana 

 pipiens, R. palustris, R. halecina, Salamandra maculata, S. [Amblyo- 

 stoma) rubra and S. salmonea, in the urinary bladder. 



In the above indicated larval state it has been found by Filippi attached 

 to the branchiae of Cyclas cornea, and by Wagener attached to various 

 other species of Cyclas and Pisidium, in the months of July, August, 

 and September. Pagenstecher, however, believes that the true larva of 

 this Distoma is the Cercaria duplicata of Moulinie, or, in other words, 

 the Rhopalocerca tardigrada of Diesing. 



2. Distoma clavigrrum, Rudolphi. 



D. clavigerum, Rudolphi, Dujardin, Bellingham,Cobbold, Pagenstecher, 

 Van Beneden, Diesing, Revis. der Myzelminth. p. 34. 



Fasciola Ranee, Froelich. 



In statu larvae. 

 Cercaria {Acanthocephala) ornata, Diesing, Revis. der Cere. p. 19. 

 Cere, ornata. La Valette, Pagenstecher. 



C. armata. Van Beneden (ex parte). 



Hab. This species is likewise abundant in frogs, and has been found by 

 Froelich, Bremser, and Dujardin, in Ra7ia [Pelophylax) esculenta, 

 Dendrohyas viridis, and in Phryne vulgaris ; in the intestines of Bufo 

 viridis by Olfers ; in Rana temporaria by Bellingham, Pagenstecher, 

 myself, and others. 



The larvae have been found by La Valette and Van Beneden in Planor- 

 bis corneus ; by Pagenstecher in Hydrachna concharum, and by Van 

 Beneden iu Lymneus stagnalis. 



3. Distoma crystallinum, Rudolphi. 



D. crystallinum., Rudolphi, Dujardin, Pagenstecher, Diesing, Revis. p. 34. 

 Hab. Rudolphi discovered this in a cyst attached to the heart of Pelias 



Berus. It has been indicated also in Rana temporaria, R. esculenta, 

 Bufo viridis, and Bombinator igneus by Gade, Pagenstecher, and others. 

 It is usuallv encysted. 



