474 ONISCIDA. 
The inner antenne are very minute and four-jointed, 
the second joint in some of the species appearing to be 
formed of several minute rings. The outer antennez are 
seven-jointed, the basal joint also occasionally appearing 
as if formed of two portions. The base of the second 
joint is dilated; the fifth joint is long and somewhat 
slender, being considerably longer than the two terminal 
joints united. The details of the mouth-organs are 
described under Porcellio scaber, and need not, therefore, 
be here given. The elongation of the terminal appen- 
dages of the tail, to a considerable length beyond its 
extremity, also distinguishes these animals from Arma- 
dillo, the inner lobe of the basal support being even 
occasionally visible beyond the terminal joint of the 
tail. 
