STUDIES OX THE ECTOPARASITIC TREMATODES OP JAP AX. 229 



seminal receptacle. Vaginal openings in the lateral region of the body; 

 about half as distant from the outer border of tlie intestinal trunk as 

 from the lateral margin of the body ; in a plane a little in front of 

 that of the paired yolk-ducts. The mginal canals proceed thence a 

 little backwards and towards the median line, where they unite and 

 form a single short duct, whicli then opens into the seminal receptacle 

 side by side with the unpaired yolk-duct. Testes situated behind 

 the ovary, numerous, closely packed, occupying nearly the whole 

 mesial region of the body posterior to the ovary, and enclosed by the 

 intestinal trunks. 



Habitat — Cloaca of Rliina spj (Jap. Katasashi-zame). 



Localitij — Mitsugahama. 



Date— August 1889. 



Tliat the species above described is new can, I think, be hardly 

 doubted, as it presents many diiferences from C. Kroijeri. To men- 

 tion only one, the hooks of the present species are much longer than 

 those of C. Kroijcrij the latter being, according to my own measure- 

 ment, only 0.30 mm. long ; and their forms are also different, as mav 

 be seen by comparing fig. 5 with fig. 14, PI. XIX, the latter of 

 which has been drawn from a specimen of C. Krogeri brought back 

 from Em'ope by Prof. Ijima and kindly lent me by him. 



VIII. MoNOCOTYLE, Taschenberg. 



Tliis genus is due to Taschenberg wlio erected it in 1878 for au ectoparasite 

 found by liim on the gill of MijUohates aquila in Naples, and named by liim 21. mylio- 

 batis, -wbicli lias remained, up to tbe present date, the only species of the geuns. The 

 somewhat imperfect description by Taschenberg i> is as follows: " Der Korper 

 ist langgestreckt, von vorn nach hiuten etwas erweitert, und triigt am hintern Ende 



1). Ta,s3lieiib3rg - Helininfchologisohes. ZaitsoKr. £. d. gesiinm. Xaturwiss., Bd. 51, 1878. 

 p. 562. Cited on the combined authority of Braun on the one hand and Parona and Perugia 

 on the other. 



