The Cionus 
hand, is puckered by knotty excrescences, 
which change their shape considerably in the 
act of crawling. When moving, with the 
flexible fore-part of the body groping to find 
its way, the grub consists of a series of waves 
that follow one another in perfect order. 
Each wave starts from the hinder extrem- 
ity and by swift degrees reaches the head. 
Straightway a second wave follows in the 
same direction, succeeded by a third, a fourth 
and so on, indefinitely. Each of these waves, 
proceeding from one end of the grub to the 
other, is a step. So long as the wave con- 
tinues, the fulcrum, that is, the orifice of 
the intestine, remains in its place, at first a 
little before and then a litle behind the move- 
ment as a whole. Hence the source of the 
sticky dew grazes first the tip of the abdo- 
men and then the end of the back of the mov- 
ing grub. In this way the tiny drop of gum 
is deposited above and below. 
The glue has still to be distributed. This 
is done by crawling. Between the puckers, 
the cushions, which the locomotory wave 
brings together and then separates, alter- 
nately come into contact and open clefts into 
which the sticky fluid gradually makes its way 
317 
