pees 
endless variety of this condition is to be met with — that in the 
short stretch from the spinal cord to the tip of the myotome two 
macro-ganglion cells may be applied together in dumb-bell fashion in 
the mesoderm, while from their free ends there proceed two macro- 
axis-cylinders, the one towards the myotome-apex, the other to a 
macro-ganglion cell in the cord. 
Here once more the variations observed are endless. For in- 
stance, I have figures in which this gap between myotome and cord 
is bridged over by a long closely applied chain of half a dozen or 
more macro-ganglion cells, or, on the one side of the body a fine 
nerve fibril (free from nuclei), reaching from the cord to the tip of 
the myotome, as in fig. 3, may be present, while the similar fibril on 
the opposite side may have some 2 or 3 macro-ganglion cells applied 
to its upper and lower surfaces in its course !). 
mun. 
Fig. 3. Transverse section 
of a R. batis of 25 mm. 
From what has been written above it will be obvious that these 
macro-ganglion cells, either of themselves or by means of the fibrils 
which they spin, strive to reach the apical region of the myotome. 
Their axis-cylinders very soon attain this end, and connections between 
centrally lying ganglion cells and the tips of various myotomes have 
become established in embryos like the two above mentioned. Fig. 3, 
though taken from a much older embryo in which the central ganglion 
cells have acquired capsules (ca. c.), is meant as an illustration of 
this. A fine’ axis-cylinder (ma. n.) (in reality finer than depicted), free 
from nuclei, is seen passing between the tips of two myotomes (mp.), 
but the mode of termination is not figured. 
In numerous instances there may be seen lying on the tip of 
1) This and other cases will be illustrated elsewhere. I have felt 
very strongly the necessity of strictly limiting the number of figures in 
this preliminary paper. 
