[FT FÖR LILLJEBORG lo 



• : .1 found that in my Mexican ones the cells arc about three 



varying. The distan n the cells varies considerably. 



Sometimes they are situa Perrier figured them, but now and then I found two 



cells almost adjoining. Generally the distance between two cells was equal to about 

 three, four, and five diameti rs of the cell itself, but frequently the distance was 

 : this in the circumference of the equator of the somite. In the direction of the 

 dianuti r of the body the cells were much closer, or two to three diameters apart. 

 Size and shape of the cells. In size these cells generally slightly sur- 

 1 the unicellular glands, especially as regards the diameter af the base, 

 but at the apex they are narrower than these glands. The form is always that of 

 in- with very broad base. The drawings given by Horst and Perrier of the 

 cells is imt exactly the one observed by me. Perrier figures the cell as being round, 

 with a long neck opening outwards through the cuticle, in shape like a common 

 laboratory wash bottle. Horst again gives the correct outline of the cell, but figures 

 it a- situated far below the cuticle. The cells in my specimens again, in sections 

 which are strictly perpendicular to the epidermis, arc situated immediately below 

 the cuticle, from there extending to the plate on which the epidermal cells are super- 

 • I (figures 7 to 14, pi. ii). In sections again which more or less deviated from the 

 perpendicular line, as regards the epidermis, it appeared as if the cell did not reach the 

 cuticle, but was superposed by cells of a supporting nature (fig. 7, 10, 12 and 13). 

 ( )f these figures, 12 is taken from a section considerably deviating from the perpen- 

 dicular, while 7 and 13 were only slightly so. From an examination of hundreds of 

 cells I am satisfied that as a rule the cells immediately touch the cuticle, when fully 

 loped, and only in one or two instances did I find cells which, while appa- 

 rently fully developed, were- confined to the lower level of the epidermis, and super- 

 d by other cells. I do not by this wish to indicate that Horst's figure was 

 made from an extra-perpendicular section, as it may be possible that our respective 

 g ttions have been made on different species. I have in fact found several 

 differences between the characteristics of Horst's Pontoscolex corethrurus and those 

 of my • - worms. The references to these, however, must be left to another 



u Pontoscolex now in preparation. Here I will only state that in my spe- 

 dal zone does not possess the blood vessel described and figured by 

 Dr. Ho 



Description of the cell. What interests us from the beginning is the 



angement of the cytoplasm. Already with a low power it can be seen 



the central nucleus there is a distinct and peculiar dark-staining cyto- 



ap, which sends upwards two wide horns of very slightly-staining cyto- 



