STUDIES OX THE ECTOPARASITIC TREMATODES OF JAPAX. 35 



the (lorso- ventral übres of the body, ramify towards then' ends (PI. 

 XX, figs. 0, 6, and 7). (4) The last gronp of filjres is confined to 

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

 as the transverse fibres do the sucker (PL XX, figs. 5 and (J). 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 Ijadly preserved that I have not been 

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

 few points will be noted. 



The anterior suckers occupy nearly the same position in the Ijody 

 as in Trhtoumm. 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 each other by a membranous anterior portion of 

 the body that lies between them. 



'Ï\\Q posterior sucker is either circular or elliptical in outline, and 

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

 ventral surface into separate areas as in Tridomtim. The musculature 

 consists of the circuLu- (in two sets, d(jrsal and ventral), tlie trans- 

 verse, and the irregular radial fibres which are direct continuations 

 of the longitudinal fibres of the body ; and these Vari(jus filires are 

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

 of Tristomum, 



Sticky Glands — Under this head I include all th(jse glands 

 which are present in \^arious parts of the b(xly and are not intimately 

 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 



