698 A. Ff. Goldfarb 
space in the anterior segments is filled with a loose mass of tissue, 
partly degenerating muscles, partly connective tissue in which 
are many blood cells and other small cells. Among these small 
cells (primitive nerve cord cells) are a few ganglion cells, Fig. 16. 
These latter are round or pear shaped, with relatively enormous 
nuclei, and with a distinct nucleolus. (Fig. 16 represents a greater 
magnification than Fig. 15.) A little farther posteriorly the num- 
ber of typical ganglion cells increases, and these are arranged 
around the periphery. ‘There is also present the membrane sur- 
rounding the cord, Fig. 17 (same magnification as 16). In the 
8th segment the cord is quite normal. 
Fig. 18 Longitudinal section of early stage in regenerated cord. Migration of ganglion cells and 
collection of masses of small cells clearly shown. S, sheath of cord; R, regenerated cord. 
No. 1.94. Amputated anterior 4 segments. Removed cord 
from the next 4 segments. Time, 20 days. Segments 5 to 8, 
inclusive, contained no cord. A cap of blood cells and minute 
nerve cells had formed around the anterior end of the cord. 
In 1.47 the cord was removed from 2 segments. A longitud- 
inal section, Fig. 18, is instructive. The broken end of the old 
