230 



S. GOTO. 



einen ziemlich gvossen sitzenden Sauguapf. Derselbe besitzt aclit Speichen, von 

 deuen die eine in der Liiugsaclise des Tliieres gelegen ist, wUlireud jederseits drei 

 vom Centrum nacli der Peripherie liin ausstraldeu. Da wo die beiden letzten den 

 Baud des Saugnapfes erreichen, siud zwei grosse, starke Cliitiuliaken eiugefiigt, die 

 in der Queraolise desselben gelegen siud. Die Muudoffuung am vordern Korperende 

 ist selir wait iiud dient gleiclifalls zum Ansaugen. Die Liinge des Tliieres betriigt 

 5 mm. bei einer Breite von 2 mm. Der Sangnapf liiilt 1.5 mm. in Dnrclmiesser. Die 

 Farbe ist weisslich." Later in 1890 Paroua and Perugia'^ pnblislied a short 

 anatomical description of the same species, confining themselves, however, from 

 want of material, to the consideration of the sucker as well as some parts of the 

 genital organs. Many of their statements, however, seem to me so anomalous and 

 are in many important respects so at variance with the results of my own studies 

 as set forth in the anatomical part of the present paper that I have thought it 

 advisable to base myself only on my own observations in forming the diagnosis of 

 the genus, which I believe I can best embody in what follows : 



Body elongated, flattened; with a large circular, sub- 

 sessile, sub-basilar, posterior sucker, the internal surface 

 of which is divided by means of eight radial spokes meet- 

 ing at the centre into as many equal secants. The pos- 

 terior radial spokes lying on each side of the median line 

 carry each a large hook. Mouth large, subterminal, 

 ventral, destitute of any sucker. With three testes. 

 Common genital opening ventral and median. Vaginal 

 opening ventral and lateral. With two pairs of eye-spots. 



1. MmiocoUjle Ijimae ^\ n. sp. 

 (Pis. XVII & XVIII.) 

 Body about 3 mm. long, elongated, flattened, but not very broad; 

 posterioi'ly pointed ; gradually becoming narrower in front and 



1). Parona e Perugia— Di alcuni trematodi eetoparassiti di pesci adriatici. Annali del 

 Mus. Civ. di Storia Naturale di Genova. Ser. 2, vol. IX, 1890. Estratto pp. 5-8. 



2). Dedicated to Isao Ijima, Ph. D., Bigakushi, Uigdkuhakushi, Professor of Zoology 

 in the CoUege of Science, Imperial University, Tokyo. 



