50 THE MICROSCOPE. April 
angular and project like the teeth of asaw. Glow-worm, 
Fire-fly, and Skip-jack are examples of this class (fig. 4). 
5, Pectinate or comb-like, in which the segments have 
long processes on one side like the teeth of a comb or on 
both sides like a feather (fig. 5). 
6. Clarate or club-shaped, in which the segments be- 
come gradually broader and the whole organ assumes 
the shape of a club as in the Burying Beetle (fig. 6). 
7. Capitate or with a head, in which the terminal seg- 
ment or segments form a large knob (fig. 7). 
8. Lamellate, in which the segments that compose the 
knob are extended on one side into broad plates, e. g. 
Cockchafer (fig. 8). 
These organs are very important in all insects and 
form distinguishing characters in the genera and species. 
They are situated on the head near the eyes and deserve 
particular attention and study. They are very wonder- 
ful in their construction and appear to be very useful, 
for by them insects seem to communicate. Some think 
they are organs of hearing as well as of feeling and some 
think insects may possess a sense which we know nothing 
about. 
Look at the head of the common dung beetle, which has 
clubbed antenne formed of leaflets, capable of being shut 
up. The antenne of the cockchater, a Lamellicorne 
beetle, consist of leaflets also, and if soaked in liquid 
potasse, then dried between two slides, soaked in turpen- 
tine and mounted in Canada balsam, it will show a cellu- | 
lar tissue of oval cells, with nucleus and nucleolus, ac- 
cording to Quekett; but with an external cuticle of hex- 
agonal cells, according to Carpenter. The organs of 
sensation, sacs and saeculi are found in them. These 
have been described in our article on the Honey-bee. 
See November, 1895. 
One species of the Ichneumon fly presents singularly- 
shaped perforations, in which the transparent membrane 
