20 Art. 3. — T. Kaburaki : 



like the horizontal bar which joins the two upright pieces jn the 

 letter H. Also the gut branches of Micro'pharynx 'paraûtica Jäger- 

 SKiöLT) are numerous^ subdivided and anastomose, quite similar to 

 the appearance that occurs in some Polyclads (Pseudoceridae, Eury- 

 leptidae, etc.). Any sign of such an anastomosis could nowhere 

 be found in Kct. Umuli. 



The intestinal cavity is lined by a continuous epithelium con- 

 sisting of two sorts of cells, one of which constitutes the greater 

 portion of the lining while the other is glandular. In most species 

 the former cells are always either columnar or nearly conical and 

 appear vacuolated at the distal portion. The nucleus alwaj^s lies 

 close to the basal portion, where the protoplasm is very finely 

 granular and deeply stainable. Besides, the cells contain numer- 

 ous granules of small size. In some specimens of St. trigonoce- 

 phala the cells are found to contain various granules but in a 

 sparse number. Between those cells just mentioned there exist 

 the goblet-shaped glandular cells which are well known as Minot's 

 glands. They are full of coarse granules of homogeneous 

 substance, deeply stainable with eosin and orange-G, and having 

 strongly refractive powers. The cells occur more abundantly in 

 the epithelium of the main trunk than elsewhere. 



In the planarians digestion is regarded by Ijima (29) and 

 others as taking place intracellularly. According to Arnold (1), 

 however, the food taken in is in all probability inter- and intracel- 

 lularly digested. As to the intercellular digestion he says as 

 follows: " The intercellular digestion is limited to fat. The fat 

 is broken down in the lumen of the intestine by the secretion of 

 the goblet-cells into fatty-acids, which are then absorbed by the 

 columnar cells and synthesised again into neutral fat. 



" Most of the fat is digested in the cytoplasm of the columnar 

 cells, but some of it is extended into the parenchyma at their 

 base, and appears in the yolk cells and in the wandering cells." 

 Concerning this subject I have now little to add to what has been 

 written. The digesting product can pass into the tissue only by 

 osmosis and filtration. 



Respiration is regarded as being carried on in these worms 



