STUDIES UX THE ECTOP.ARASlTir TREMATODES OF JAPAN. 47 



radiates, in <'<)ii.se<|iiena', in the form oi' tlirends IVom nroiind flu; 

 nucleus to\v;irds the cell-iueml)r;nie. Tu some cases, however, there 

 are no vacuoles, and tlie eell-hody ccmsists sim])ly«)f ;i slightly stained, 

 o-ranular protoplasm. In still other cases (''.(j., on the right side (d' tlic 

 prostate glands around the vas deferens in fig. 1, PI. A'^HI), the cell- 

 memhrane is incomplete, and tlie houndaries of adjacent r-ells arc 

 more or less obliterated. In the tcrmintd portions of the 1)ody as 

 well as around the ducts of the genital organs, the endoparenchy ma 

 consists of truly fihrous connective tissue interspered with small nuclei, 

 Avliich are sometimes surrounded hy a scanty mass of granular 

 protoplasm. Around the ducts of the genital organs I have often 

 observed much larger, oval or elongated rmclei surrounded also Avith n 

 scantv mass of grarmlar protoplasm ; but they seem to have no special 

 function. The meshes of the C(jnnective tissue are filled in some parts 

 with slightlv stamed granules and in others with a perfectly ti-ans- 

 parent, clear fluid (PI. AMIT, figs. 2, 8, and 4). 



In most species of ]\ficrocotiiIe, the greater part of the endo- 

 parenchyma is of a fibrous nature ; but in some parts it consists of 

 true cells, while in others thei-e is some tendency in it to assume the 

 character of a syncvti urn. Thus in Micvocotijle. tmncata (V\. Ill, fig. 

 (1) and .1/. catiddia (PI. Ill, fig. !)), the endoparenchyma consists in 

 the lateral pait of the median portion of the body free from the 

 vitellarium, often of polvhedral cells each usually with a distinct 

 membrane, a vacuolated cell-body, and a nucleus in the centre, from 

 which the protoplasm radiates in the form of fibres towards the 

 periphery, just as in some mesenchym:i cells of Axinc alread}^ de- 

 scribed. In il/, caudatn the vacuoles are less distinct, and the whole 

 cell is more granular and more deeply stained tli;ui in .1/. fniiicntd. 

 Tdie nucleus usually encloses a single nucleolus, but sometimes more ; 

 and the l)oundaries of the adjacent cells are, in many cases, more or 



