Fiirther notes on the genus Microcotyle. 



397 



Mi*'!- 



''.* 



-vd 



I 



terminal inouth is flanked bj' suckers which liave a central partition. 



The Pharynx is large but ratlier delicate in structure opening into 



a sliort esopliaf^us whicli divides in front of the genital pore. The 



genital pore itself is situated 



verj' near the anterior end of ^—^-'^s 



the body. It opens into a 



rounded sac thickly armed witli \[! ^^ "A^fjp 



spicules especiallj' closelj' set 



round the aperture. There are f*^ '^' ^'Vvo 



two smaller «rroups of spicules ^ 



placed laterally behind and the 



sac is surrounded by radiating 



muscle fibers (Fig. Cb). The 



Uterus and Vas deferens open 



into this sac, the latter through 



a delicate bulbous structure which 



appears to extend forward beyond sg ■ 



the end of the Uterus. The 



vaginal orifice lies behind and 



in the mid-dorsal line. 



One important respect in 

 which this worm differs from 

 the other Microcotylidae, is the 

 fact that while in almost all of 

 the others the ovary is placed 

 across the middle of the body 

 in the form of a long convoluted 

 tube, in this case it is a more 

 or less globular mass like that \ '^V*-, ^- 

 of the distomes placed on the 

 riglit side just anterior to the 

 testes. On the riglit side above 

 this may be plainly seeu the 

 seminal reservoir and also its 

 duct joining the oviduct. The 

 Shell gland is in the usual a 



Position behind or beside the tail 



of the Y-shaped vitelline reservoir. The oviduct is apparently given 

 oflF the ovary toward the middle of the worm and receives the duct 

 from the spermatheca and vitelline reservoir before entering the 





5W 







Fig. C. 



a Microcotyle ange- 

 Uchthys n. sp. 



b Genital pore. 



c Chitinons skeleton 

 of a caudal sucker. 



