H 



A HISTOEY OF KECENT CRUSTACEA 



CHAPTER XXI 



ISOPODA 



Tribes. 

 Chelifera 



{ ( Flabellifera 



Yalvifera 



'X Asellota . 

 ' Phreatoicidea 



y Epicariclca 



Families 

 f Apseudidae 

 i_\ Tanaidas 



— /Anthuridffi 

 G-nathiidEe 

 — Cirolanidie N 

 ...., Corallanidae 

 i. Alcironid^ 

 , J Barybrotidaj 

 ,.4^gid» 

 --r- Cymothoid^ 

 — - SerolidiB 

 -~— SphjeromidfB 

 — ALimnoriidiB 



-^ Arcturidas 

 1^ Idoteidse 



• — f Asellidaj 

 --I Munnopsidas 



. Phreatoicidae 



~i Microniscidae 

 j Cyproniscidae 

 { Dajidae 

 Cabiropsidae 

 Cryptoniscidfe 

 Entoniscidge 

 Bopyridse 



Ligiidge 



■73 



o o 

 S be 



N Tylidse 



Oniscoidea /^ Helleriidae 



^ Oniscidae 

 ^ Armadillididae 



Sithorcler 2. — Isopoda. 



The Isopoda form a vast and widely distributed army. 

 In contrast with the distinctive uniformity of the Cumacea, 

 they exhibit an extreme diversity of shape. The name was 



