interna), sometimes divided into two or three separate chambers. The 

 ducts of the prostate and granule -forming glands enter into the body of the 

 posterior part of the penis and sometimes they form therein reservoirs 

 where their secretions accun^ulate (vesicula prostatica interna and vesicula 

 granulorum interna). On the upper free end of the penis very often are 



Fig. 93. Microcotyle caudata Goto, 

 sagittal section of the body in the 

 region of the sex aperture. In 

 addition to the little sex sucker there 

 is also an armed sex atrium. En- 

 larged 250 times. (According to 

 Goto, 1894). 



Fig. 94. Monocotyle ijimae Goto, 

 sagittal section of the region of 

 the sex aperture. Enlarged 140 

 times. (According to Goto, 1894). 



located, in different fashion but for the most part as a corona of more or 

 less complicated configuration, chitinous thorns or hooks which as a rule 

 are of sharply prescribed form and of constant number in each species. 

 Among many types as was mentioned 

 before, the terminal part of the sem- 

 inal ejaculatory duct forms a chitinous 

 pipe which either terminates at the 

 end of the penis or even extends be- 

 yond. In isolated cases (among cer- 

 tain genera) the chitinous pipe is 

 longer than the copulatory organ 

 and extends not only forward from 

 it but posteriorly; very often a 

 special muscular formation, not 

 correlated with the penis, is located 

 on it--bulbus eiaculatorius (as for 

 instance Monocotyle, Fig. 94). The 

 histological structure of the penis can 

 become very complicated. Its muscu- 

 lature is usually arranged in four 

 layers, an exterior circular--adjacent 

 to the surrounding membrane, two 



p. 64 



Fig. 95. Capsala sp., cross section 

 through the copulatory organ. 



59 



