On two new Aniphistome parasites of Suuiatraii fishes. 671 



tliese pigmented trunks. On can liere an there find the pig-mented 

 canal almost suspended in the Inmen of the other. This seems to 

 depend merely on the proximity of one to the other, but in addition 

 there are distinct canals which form a direct communication between 

 the endothelial tubes and tliose with pigmented epithelium. In these 

 hardened specimens no ciliated fimnels could be recognized, but it 

 seems evident that the excretory System as described comes into 

 very intimate relations with the parenchyma. 



The nervous System has not been thoroughly studied. It con- 

 sists, however, of lateral ganglia near the Oesophagus joined by a 

 commissure which passes over the buccal pouches. This is very 

 thick and many ganglion cells may be seen associated with it 

 and the ganglia. Trunks run, as usual, forward and backward along 

 the sides of the body. It is curious that there are to be found 

 especially in association with the nervous System, but also scattered 

 through the parenchyma and chiefly just beneath the skin, and 

 about the alimentary tract. abundant. irregulär cell-like structures 

 loaded with eosinophile granulations. These vary in size and form, 

 and it is usually very difficult to make out anything resembling a 

 nucleus. Their exact nature and function 1 must leave obscure. 



Other cells, the well-known subcuticular cells are present in 

 ([uantities among the cuticular fibres sending their processes through 

 to the skin. 



The worm is, of course, hermaphrodite. There are two well- 

 defined. lobulated festes situated at about the middle of the body, 

 one in front of the other. They have not fused into one mass as 

 has been described for members of this genus. On the contrary, 

 each sends a stout vas deferens from its dorsal anterior portion to 

 the elongated and convoluted cirrus sac. The sac into which these 

 canals open is very thin-walled, very long, and much folded upon 

 itself, and is usually filled with spermatozoa. It communicates 

 directly with the convoluted thick-walled but narrow tube which 

 lies inside the actual cirrus sac and which opens at the point of 

 the Papilla which lies in the genital cloaca. This tube is lined 

 with thick, rough cuticle and is provided with a concentric coat of 

 what appears to be muscular tissue. In the terminal portion of 

 the sac it is surrounded by a mass of large, irregulär cells with 

 large vesicular nuclei outside of which there is finally the thick, 

 fibrous wall of the sac itself. In all probability this ejaculatory 

 apparatus is not protruded to any great distance from the cloaca. 



Zool. .Tahrb. XXII. Abt. f. Syst. 45 



