498 FOOT. [Vox. XIV. 
with nearly completed cocoons, and in all these cases the sacs 
were found to be empty and flattened. In some cases a large 
mass of spermatophores was aggregated at one end of the 
slime-tube, covering ‘segments 9 to 11 of one worm, while the 
same segments of the other worm showed no spermatophores. 
In the former case the spermathecal sacs were empty; in the 
latter, full. An examination of the spermathecae of twenty 
worms that were not copulating showed only one with empty 
spermathecae. This indicates that the sacs are not filled and 
emptied during one copulation. The above facts seem rather 
to necessitate two copulations, one to fill the spermathecae, 
and one to form the cocoons. I have several times watched 
copulating worms from three to five hours consecutively, and 
seen them separate without being able to identify a cocoon in 
any stage of formation. Copulating worms are, however, so 
y 
if 
) 
SS WN 
SQ 
ei 
Zp NS 
Fic. 2.— Spermatophore. x 150. 
easily disturbed that it would be necessary to repeat this 
observation a great many times, as well as to examine the 
spermathecae after the worms have separated, before accepting 
such observation in proof of a second copulation. 
SPERMATOPHORES (text Fig. 2). 
The spermatophores are formed after the spermatozoa leave 
the spermathecae. The contents of the latter when stirred 
with a needle in water will disintegrate, each spermatozoon 
