172 Journal of Entomology and Zoology 
alcohol, sections were cut in paraffine. Some sections were stained 
with iron hematoxylin, but some were mounted unstained and occa- 
sionally a very line Golgi-like impregnation of certain cells with 
their branches was evident. From such preparations it was learned 
that the cell processes were about one to a cell and that this often 
branched at half its length or a little more, although it was difficult 
to make this out because of frequent crossing of the fibers. iVIost 
cells seemed to be uni- or bi-polar, but some had other branches 
running back among the cells of the celular area. In some places 
the long fibers from the cells were very wavy and they often ran 
slantingly, crossing many cell processes, some may have been larger 
than others, although it was impossible to be sure of their compara- 
tive size because of differences in position and staining. In small 
specimens smaller fibers or fibrils were evident and \ery numerous. 
In this, as compared with the starfish studied, there was more the 
indication of fibrillae, but no marked de\-elopment of these. On the 
whole, the central ner\-ous system seems more like the complex sys- 
tems of other forms than does starfish. 
The nerve cells are well marked, sometimes with nucleoli and 
with much chromatin but not usually with the characteristic arrange- 
ment of chromatin material. In some cases a small amount of 
material in the cytoplasm gave the appearance of tigroid substance. 
As in starfish, fibers from cells usually appeared as single fibrils 
especially in the adult. In many places the fibers or fibrils seemed 
to start rather abruptly from the outer zone of cytoplasm of its cell. 
In a few cases two fibers seemed to start from the same place in a 
cell, but this of course may have been where one of the fibers in 
crossing was cut off, or possibly fibers entering and leaving the 
same cell. The details of fibers and cells were taken from Flem- 
ming's Huid preparations either stained or unstained. 
The segmental arrangement of ganglia in the arms is one of the 
well known features which forms such a striking resemblance to 
the ganglionic cords of many segmented animals. In some of the 
smaller specimens the condition of the gangila is especially well 
marked, towards the ends the nerve strand becomes quite reduced. 
In longitudinal sections of the arms of serpent stars the thicker cell 
area is, of course, that of the superficial radial nerve while the cells 
