196 



s. GOTO. 



Habitat — Gill of Sciaena siiia (Jap. Ishimochi or Guclii). 

 Localitjj — Mogi (near Nagasaki). 

 Date— J ii]y 1889. 



II. AxiXE, Abildgaard. 



This geiins was erected by Abildgaard towards the close of the last century. 

 He described in 1794 a species, J. belones, from the gill of Esox helmies. In 1836 

 Diesing divided it into two species, Heteracanthus pcddtus nwà H. saghtdtiis ; but 

 in his " Systema lielminthiim " he again united them into a single species. '^ In 

 1861 P. J. V. Beneden-> again described the same species and made some observa- 

 tions on the genital opening and the spines with which it is armed. He also 

 observed the similarity of the suckers to those of Dijdozoon. In 1863 the same 

 writer in conjunction witli Hesse^) described two species, A. orj)hü from the gilt 

 of Eso.v hclone and A. trujlae from the gill of Trhjla hinindo. The former, is, how- 

 ever, granted by later writers to be identical with A. bchvics, already described by 

 V. Beneden. Finally in 1878 Lorenz*) published a very detailed accounl 

 of the anatomy and histology of A. belones. 



In accordance with the facts mentioned in the anatomical part of the present 

 paper I give the generic diagnosis as follows : 



Body elongated, anteriorly slender, but broad pos- 

 teriorly. In consequence of an une (|u a 1 d e v e 1 o p ni e n t of 

 the two sides of the caudal disc the body is asymmetrical, 

 and the posterior end occupies a lateral position. The 

 lonirer side of the caudal disc bears numerous suckers, is 

 either convex or straight, and is bent at an angle to the 

 lateral border of the body proper ; the other side bears only 

 a small number of suckers or (?) none at all. No chitinous 

 hooks at the posterior end of the body. With a single, 



1). Diesing— Systema lielminthum, vol. I, p. 425. 



2). P. J. V. Beneden— Mémoire sur les vers intestinaux, p. 53. 



3). P. J. V. Beneden et Hesse — Recherches sur les Bdellodes et les Trematodes marins. 

 p. 116-117. 



4). Lorenz — Untersuch, ü. d. Organisation d. Gattung. .i.sine u. Microcotyle. Wiener 

 Arbeiten, Bd. I, Hft. 3, pp. 3-20. 



