148 THE ANIMAL PARASITES OF MAN 



Fam. Schistosomidce resemble the Fasciolidce in structure, but differ 



sexually. 

 Genera : Schistosomum, Bilharziella. 



Fam. DidymozoonidcB , a group that is but little known, and the 

 members of which (Didymozoon, Nematobothrium} live in pairs 

 in cysts on the exterior surface of the body of marine fishes or 

 in the cavities of their mouth or gills ; sexually distinct. 



Fam. Rhopaliadcs ; hermaphrodites. Resemble the Fasciolidce in their 

 organisation. They have an oral and a ventral sucker, with two 

 retractile rostrella ; the genital pore is rather forward and on 

 the ventral surface ; genital glands are situated in the posterior 

 end. 

 Genus : Rhop alias. 



Fam. Gasterostomidce, with the oral orifice on the ventral surface 

 and a simple intestinal sac. G aster ostomum in the intestine of 

 fishes. The cercaria stage termed Bucephalus also belongs here. 



Fam. Monostomatidcz, resemble the Fasciolidce in their organisation, 

 but have only the anterior sucker ; the genital pore is situated 

 on the anterior part of the ventral surface ; the genital glands are 

 usually in the posterior third of the body ; the intestinal fork 

 may be with or without appendages, often again meeting at the 

 back in the shape of an arch. 

 Divided into several sub-families and numerous genera. 



LITERATURE. 



The literature on Trematodes is very extensive, but also very scattered; that 

 which has been published up to 1892 is mentioned and has been utilised in my work 

 on Trematodes (Braun's Cl. u. Ordn. d. Thierr., Lpzg., vol. iv., part i ). Of the works 

 that have appeared later the following only need be mentioned here : 

 BETTENDORF, H. Muse. u. Sinneszell. d. Tremat. In.-Diss. Rostock, 1897 (Zool. 



Jahrb. Anat., 1897, part x., p. 307). 



BLOCHMANN, F. Die Epithelfrage bei Cest. u. Trem., Hamburg, 1896. 

 BRAUN, M. Arten d. Gttg. Clinostomum (Zool. Jahrb. Syst., 1900, part xiv., p. i). 

 Tremat. d. Chelonier (Mitth. zool. Mus., Berlin, 1901, ii., p. i). 

 Tremat. d. Chiropt (Ann. k. k. nat. Hofmus., Wien., 1900, xv., p. 217). 

 Z. Kenntn. d. Trem. d. Saugeth (Zool. Jahrb. Syst., 1901, part xiv., p. 311). 

 Fascioliden der Vogel (ibid., 1902, xvi., p. i). 



FISCHOEDER, F. Paramphist. d. Saugeth. In. Diss., Kgsbg., 1902. 

 KOWALEWSKI, M. Several works in Polish, but with resumes in French or German, 



in d. Sitzber. d. Ak. d. Wiss. Krakau. 



LUHE, M. Ueb. Hemiurtden (Zool. Anzgr., 1901, xxiv., p. 394). 



Looss. A. Die Distomen unsr. Fische u. Frosche., Stuttgart, 1894 (BibL.zool. xVi.)- 

 Rech. faune paras, de 1'Egypte, i. (Mem. Inst. egypt., 1896, Hi., p. i). 

 Weit. Beitr. z. Kenntn. Trem.-Fna. Aeg. (Zool. Jahrb. Syst. 1900 part xii 



P- 521). 

 MONTICELLI, F. S. Stud. Trem. endop., i. (Zool. Jahrb. Suppl., iii., 1893). 



