290 E. A. ANDREWS 
The present paper describes only those organs of the male that 
are combined to form a safe conduit for the sperm from the male 
to the receptacle on the female. 
The actual sperm transit apparatus of the male consists of three 
organs on each side of the body. The anatomy and use of these 
three organs are here described in detail. 
The ‘papilla’ or end of the deferent duct is provided with glands 
and a valve. It is distended by blood and applied to fit accu- 
rately to the beginning of a tube. 
This tube is the innermost part of the groove of the first stylet, 
or limb of the abdomen, and hitherto its existence and use has not 
been described. 
The first abdominal limb is, in action, a duct leading the sperm 
uninterruptedly from the deferent duct into the receptacle of the 
female. It contains large glands of problematical use, and relies 
for mechanical support upon the habit of the male in using the 
second abdominal limb as well as one of the fifth thoracic limbs 
to insure the entrance of the first stylet into the receptacle of the 
female. 
The second stylet is accessory to the first in applying its hand- 
like outgrowth over the papilla and insuring a tight joint. It 
also gives mechanical support to the first stylet. How much it 
may also serve as a piston for cleaning the tube or even for aiding 
in sperm transfer is left undecided. 
The ontogeny of the first stylet shows that it begins after the 
other abdominal limbs and is from the first a simple unbranched 
outgrowth which becomes a tube by the depression of its central 
and elevation of its lateral parts to form a deep groove, the bottom 
of which is ultimately isolated by a shelf. 
The morphology of the organ, based upon its use, anatomy and 
development, gives the basis for its utilization in defining species 
and subgenera. The tip or canula that is inserted into the recep- 
tacle to discharge sperm is the real tip of the organ and all other 
tips are to be referred to lateral outgrowths from one or the other 
side of the original groove. 
The ontogeny of the second stylet shows that in the first larva 
it is just like the following abdominal limbs; but its subsequent 
