A great untouched field for exploration lies here among the Myriapods.
TWO PILL BUGS
(Armadillidium vulgare, Fab.)
Down from the time of the prehistoric monsters comes the armadillidium, the last survivor of the great land crustaceans. As the serpents and the lizards are all that remain to remind us of the monsters which swarmed and fought in the tertiary swamps and oceans, so this strange creature, no larger than a pea, which rolls itself into a ball when you startle it as you turn over a stone in the meadow, is the survivor of the land crustacea which at one time, in countless forms, abounded everywhere in the then young world.
It is not an insect, but a last survivor, related to the crabs more closely than to any other branch of the animal kingdom.