Japanese Tricladida Maricola. -i - 



Body Glands. 



Embedded in the parenchyma are numerous glands, in which 

 we are generally able to distinguish three groups of the body-, 

 pharyngeal and genital glands, as I shall call them. As (o the 

 glands which stand in intimate relation witli the pharynx and the 

 genital organs, I would desire to give a note in the paragraph con- 

 cerning those organs. 



As usual, the body-gland is composed of two kinds, viz., the 

 numerous eosinophil and the sparse cyanophil. The eosinophil 

 glands are very diffusedly but not uniformly distributed in the 

 parenchyma on each side of the body and open externally in the 

 narrow submarginal zone of the ventral surface, as already stated. 

 ■Of the species examined, in Uct. llmuli they are most well devel- 

 oped. A large accumulation of the glandular cells exists near the 

 anterior body-end. The deep ends of them are located behind 

 the brain, and in passing over the latter they run downwai-ds and 

 forewards up to making their way to the ventral surface of the head 

 close to its anterior margin. Again, such a similar but smaller 

 cluster of the glandular cells is found at the posterior extremity of 

 the body, and they open out on the posterior edge. 



The glandular cells are, as usual, of a rounded or pyriform 

 shape, and contain a homogeneous or finely granular substance. 

 In haematoxylin-eosin preparations they stain violet in Ect. 

 limuli, but deeply red in others. Each is prolonged on one 

 side into a long slender duct; the ducts unite often with one 

 another to form larger ones and then again to separate into 

 numerous fine ducts near the dermal musculature just before open- 

 ing submarginally on the ventral surface. 



Between the eosinophil glands there occur the cyanophil, 

 which are but rarely found. They are recognisable with more 

 or less distinctness in Ect. limuli, chiefiy in the brain region, as 

 compared with those in Pr. lactea and St. tricjo7iocephala, in which 

 they cannot be found with ease. The shape of the cells varies to 

 a considerable extent, but is, as usual, round or pja-iform. In 

 liaeraatoxylin-eosin preparations they usually take on a somewhat 



