INTRODUCTION. 
72 
and in others issue in tufts from rounded tubercles 
arranged in a certain order. These tufts sometimes 
assume a yeiy peculiar form, especially in the larva) 
of Tussock-moths C Orygia, Larta, &c.) and a few 
others. Two long fascicles stand out from behind 
the head and project forwards, the hairs of which 
are dilated at the jioint in such a manner as to make 
them resemble a painter’s brush. A similar fascicle 
springs from the hinder extremity and is directed 
backwards, and along the back there is a series of 
short wedged-shaped tufts of equal length foimed 
by thick-set parallel hairs. These elongated tufts 
are often rendered still more conspicuous by being 
of a different colour from the other hairs ; the latter 
also vary greatly in their tints, which are often 
mingled and diversified so as to produce a very 
omamenfcil effect. TNTien the hairs are long and 
thickly set, as is often the case, they form a very 
efficient clothing, and tend to save the larva from 
injury when it happens to fall ; they likeivise seem, 
at least in many cases, to be organs of touch, 
for the slightest impression upon them produces 
movements in the animal which indicate that it is 
felt. Lyonct has shown that those of the Goat- 
moth caterpillar are partly hollow, and set in a 
scaly ring somewhat elevated above the skin, through 
which the root communicates with a soft integu- 
ment upon which the nerves form a reticular tissue, 
a stmcture which renders it highly probable that 
they perform the function just alluded to. 
With so much difference in the form, members. 
