Further notes ou the geuus Microcotyle. 391 



it is sliown there and could be sl)0\vn to end blindly in the paren- 

 chyma and not in the intestine. It seenis to contain spermatozoa 

 and nuist therefore be put down definitely at the Receptaculum 

 seniinis. Otheiwise tlie feniale genitalia pioved to have been correctly 

 described and sketched in that paper. 



Tlie only other point of inteiest is that the W-sliaped arrange- 

 ment of cliitionus rods about tlie cirrus opening is found to be a 

 kind of chitinous skeleton for the miiscular cirrus itself, The stouter 

 anterior parts of tliese rods pierce the muscular sac obliquely and 

 come iuto immediate connection with the inner protrusible tube. 

 Outside they run quite far back and disappear near the Vas deferens. 

 They are not so clearly outlined as it seemed from the previous 

 material but give oif twigs and branches as various places. 



Microcotyle ijogoniae n. sp, 



The worm occurs on the gills of the common sea drum, Pogonias 

 cromis, sometimes in such great nurabers as to menace the life of 

 the host. 



The body is elongated with a large sucker disc which consti- 

 tutes about one-third of the total length and wiiich at its upper 

 end is sharply marked off by indentations which give it almost the 

 form of an arrow head, There are about one hundred and eight 

 suckers which reach their greatest size at about the middle of the 

 disc starting above with two small ones and again decreasing in 

 size toward the caudal termination (Fig. Aa). ^) 



The chitinous skeleton is quite delicate and has the arrange- 

 ment shown in Fig. Ae. The suckers at the mouth are large and 

 armed at their margins by a row of minute spicules. Their cavity 

 is crossed by a partition separating it into two loculi the inner 

 and larger of which is deeply indented at its median border (Fig. Ac). 

 Immediately posterior to these in the mid line is the peculiarly 

 shaped pharynx which has a narrow anterior part and a more 

 bulbous portion (Fig. Ad). A short way beliind this the eso- 

 phagus divides into the two lateral coeca which run far back into 

 the caudal disc. 



Directly behind the bifurcation of the intestine lies the genital 

 pore which is unarmed and small in proportion to the size of the 



1) Explanatiou of Abbreviations see pag. 402. 



