474 ONISCIDJE. 



The inner antennae are very minute and four-jointed, 

 the second joint in some of the species appearing to be 

 formed of several minute rings. The outer antennae 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. 



