66^ W. G. MacCam.um, 



HS for study — the size and the form of tlie posterior sucker bein,£^ 

 practically all upon whicli one could base such a comparison. These 

 forms were A. oxycephalum from Salmo and Süurus, Ä. mcgacotyle 

 frora Sihirus, A. cylindricum from CallicJifhys, A. cornn and A. ferrum- 

 equiuum, also from Callichthys, and A. attenuatum from Salmo. Since 

 this time there have appeared as far as I can ascertain no descriptions 

 of new amphistome parasites of fishes. 



FiscHOEDER^) has, however. recently reviewed in a very com- 

 plete manner the related forms which are found in mammals and 

 this systematic study throws much new light upon those parasitic 

 in the lower animals. In his tabulation and Classification of the 

 members of the group he introduces many new generic and sub- 

 generic names which on the whole seem well justifled, the chief 

 division into two great groups depending largely upon the presence 

 or absence of pouch-like appendages to the anterior or mouth sucker. 

 Those possessing these appendages he distinguishes from the Par- 

 amphistominae under the name Cladorchinae with the genera Cladorchis, 

 Stichorchis, etc. Both the worms which have been kindly referred 

 to me for study by Dr. Volz possess these saccular appendages 

 about the anterior sucker, and therefore fall into the subfamily 

 Cladorchinae. We may reserve a further discussion of their systematic 

 Position until a description of the worms themselves has been given. 



Cladoi'chis imnffasii n. sp. 



A number of specimens of this stout, rounded trematode worm 

 were obtained from the intestines of Pangasius nasiifus Blke., a 

 Siluroid fish which feeds upon the fallen fruit of a mangrove tree. 

 They were collected in the Residency Palembang (Sumatra). These 

 worms Vary a good deal in size the larger measuring 6 X 3,1 mm 

 while there are specimens which reach a length of only 3,5 mm and 

 a breadtli of 2 mm. They are almost elliptical in form, flattened, 

 but still quite thick with thick rounded edges. The formalin speci- 

 mens have a pale, greenisli-grey color and are somewhat translucent. 

 Most of them are curved ventrallj^ in the longitudinal direction but 

 not hoUowed ventrally from side to side. Anteriorly there is to be 

 Seen a small opening surrounded by a muscular mass of small size. 



1) FisCHOEDER, Die Paramphistomiden der Säugethiere, in: Zool. 

 Anz., Vol. 24, 1901, p. 367. — Desgl. in: Zool. Jahrb.. Vol. 17, Syst.. 

 1903. 



