STUDIES ON THE ECTOPARASlTlC TEEMATODES OE JAPAX. 35 



the dorso-ventral fibres of the body, ramify towards their ends (PL 

 XX, figs. 5, 6, and 7). (4) The last group of fibres is confined to 

 the radial elevations, and simply traverse these from side to side, just 

 as the transverse fibres do the sucker (PI. XX, figs. 5 and 6). These 

 fibres are absent where three elevations unite (PI. XX, fig. 4). 



Epibdella — I have been able to obtain but few specimens of 

 this genus, and these were so badly preserved that I have not been 

 able to make out the minute anatomy of the various parts j but a 

 few points will be noted. 



The anterior suckers occupy nearly the same position in the body 

 as in Tristomum. They are, however, not so well developed as in .that 

 genus, and are more of a membranous character. The two suckers 

 are also united with ^ch other by a membranous anterior portion of 

 the body that lies between them. 



The posimor sucker is either circular or elliptical in outline, and 

 is provided with a marginal membrane. There is no division of the 

 ventral surface into separate areas as in Tristomum. The musculature 

 consists of the circular (in two sets, dorsal and ventral), the trans- 

 verse, and the irregular radial fibres which are direct continuations 

 of the longitudinal fibres of the body ; and these various fibres are 

 arranged exactly like those of the same name in the posterior sucker 

 of Tristomum. 



Sticky Gtlands — Under this head I include all those glands 

 which are present in various parts of the body and are not intimatelj 

 connected either with the genital organs or the digestive system. 

 They all open on the free surface of the body, and some of them are 

 closely connected with the suckers. 



Microcotyle and OctocotyLe — In all the species of these two 

 genera that I have studied, except M. reticulata^ there are three 

 groups of sticky glands in the anterior part of the body in front of the 



