218 



Fig. 4. 



Fig. 4. Four giant cells from the anterior part of the cord of Ctenolabrus in 

 their natural relations to each other, showing variations in the form of cell and in the 

 branching of neurites. Kenyon's haematoxylin. Camera drawing. X 150. 



Fig. 5. Two adjacent giant cells lying in their capsules (cps.). an' stm. anastomosis 

 of dendrites of the two cells; cl. n'gl. neuroglia cells; fbr. n'gl. neuroglia fibres; mi. pr. 

 membrana prima; ret. n'gl. neuroglia net. Kenyon's haematoxylin. Camera outline; 

 Reichert obj. 8 a, oc. 4; details with l / a " oli immersion lens. 



They are given off most freely from the dorsal end of the cell, and 

 as a rule do not greatly influence its outline, but occasionally, parti- 

 cularly in the anterior bilaterally placed cells, they are relatively so 

 large as to give the cell a multipolar appearance. These dendrites 

 branch freely, pass through the open space of the capsule surrounding 

 the cell (Fig. 5), and then interlace and anastomose with the sur- 

 rounding neuroglia cells, thus forming a direct protoplasmic connection 

 between the giant ganglion cell and the neuroglia. In some few cases 

 observed there was apparently a direct anastomosis of the dendrites 

 of one ganglion cell with those of an adjacent ganglion cell (Fig. 5, 

 an' stm.), but the evidence was not sufficiently clear to enable one to 

 be positive that such was the case. 



Nucleus. — The internal structure of the cell is peculiar and 

 characteristic. The nucleus (nl.) is abnormally large, nearly filling the 

 cell and having in general much the same outline as the cell itself 

 (Figs. 6 — 10). The nucleus is eccentrically placed, being usually 

 crowded close up to the dorsal wall of the cell, so that sometimes 

 the cytoplasm can scarcely be seen between the nucleus and the cell 

 wall at that point (Figs. 8, 9). The chromatin network can be dis- 



