Four species of Microcotyle. 



248 



The other form, of whicli one specimen only was found in 

 Eoccus lineatus, may be described as follows: 



Microcotyle ac€intItop/iaUus n. sp. 



In the specimen before us the sucker bearing disc forms a 

 straight continuation of the body and bears eighty-six suckers ranged 

 laterally in two rows and all alike (Fig. J). The whole worm 

 measures about 7 mm >< 0,67 mm. It is gracefuUy tapered posteriorly 

 but in front narrows sharply to the neck, which is cylindrical to 

 the region of the pharynx where it again narrows. The spiny penis 

 is very conspicuous and can be everted through an opening a short 

 way behind the pharynx — hence the name given to the species. The 

 uterine opening, surrounded by a circular muscular mass, lies much 

 further back at the level of the Shoulder where the body suddenly 

 narrows to the neck. Here, too, is the anterior lirait of the vitel- 

 laria which extend back to dwindle away and disappear some way 

 in front of the foot, There is no spiny armature surrounding the 

 uterine opening. 



The mouth cavity has as usual two lateral suckers measuring 

 0,04 mm and between them is the small pharynx. The intestinal coeca 

 extend back into the foot where they are made evident by the 

 black granulär contents. 



The testicular lobules are about sixty in number and lie com- 

 pressed by one another in the posterior median part of the body. 

 The vas deferens is indistinct but appears to run tortuously for- 

 ward in the median line to empty into a long club shaped sac which 

 begins in the median line just in front of the uterine opening, It 



Fig. K. Microcotyle acanthophallus. Sucker chitinous skeleton. A, B and C 



viewed from above, D viewed from below. ß^ represents the upper half and B- 



the lower half. 



