22 
what diagrammatic and corresponds to an excretory pore 432/^ from 
the cephalic end. A few cells, evidently ganglionic in nature, could 
be distinguished in the brain, but a detailed description of them would 
be difficult and rather unsatisfactory on the present material. Like- 
wise a detailed description of the nerves would be likely to lead to 
errors of interpretation until fresh material can be found. It ma}^ be 
mentioned, however, that in one specimen in particular the libers of the 
nerve ring seem to cross, as shown somewhat diagrammaticallv and in 
slightly exaggerated con- 
dition in fig. 10. At the 
submedian papillee, and 
also in some other parts 
of the bod}^, structures 
were observed which 
were strongly indicative 
of nerve elements, fibers, 
and ganglionic cells, but 
it is thought best not to 
describe them here and 
thus to avoid a danger of 
error of interpretation. 
Muscular system. — 
On examination of 
m o u n t e d s p e c i m e n s 
cleared in glvcerine a 
marked longitudinal stri- 
ation is visible on certain 
focus. This St nation, 
rather wavey in character 
in many places, repre- 
sents the somatic muscles. 
On transverse section 
Fig. 14. — Very greatly enlarged lateral surface view of the theSC 
lateral band of a specimen cleared in glycerine. Note the muScleS are Seen tO be 
two halves (dorsal and ventral) of the band separated bv a . „ n • g ;]• ^ 
distinct line of cells; note also the nuclei and cells. ' ai'l’angecl in tour distinct 
quadrants, separated 
from each other bv the four longitudinal lines. There are about 
15 to 20 fibers per quadrant at about the cerebral plane, but in the 
equatorial plane there are many more — TO or more. These fibers are 
evidently quite long, but their length was not established. On cross 
section it is seen that the fibers in the submedian lines present the 
greatest radial diameter, while those nearer the longitudinal bands 
are smaller. The striation of the fibers is chieflv tangential to the 
worm, although occasionally a peripheral radial striation is noticed. 
The contractile substance of any given quadrant presents a notched 
or serrate appearance on its proximal border, and from the top of the 
