118 Notes on the Pairing of “ Limax Maximus.” 
tree at which the thread was attached was about 5 feet from the 
ground, the slugs being about 33 feet from the ground. One of 
the slugs was a little larger and darker than the other. At the 
time we first saw them they were loosely twisted round each other 
and their genital organs were protruding, (fig. 1), by 11-25 those 
organs had come into contact and they began to twist more 
closely round each other, (Fig. 2). In about 2 minutes more 
VY Ww WY 
| 
( 
their genital organs had become inflated and assumed the form of 
a frilled umbrella with a sphcerical form beneath, (Fig. 3); in 
about another 2 minutes the inflation of those organs kad dis- 
appeared and they began to untwist, (fig. 4), and were quickly 
withdrawn. By 11-30, they had separated, (fig. 5), and the larger 
slug fell to the ground, leaving the other alone suspended (fig. 6). 
During the whole time the above described performances took 
place the slugs kept up a continuous gyration. After about 5 
minutes spent in contortions (fig. 7), the suspended slug succeeded 
in reaching the mucous thread, thus forming a loop, and 
