ol4 A HISTORY OF RECENT CRUSTACEA 
CHAPTER XXI 
ISOPODA 
Tribes. Families 
Apseudidze 
Tanaidse 
Anthuridze 
Guathiidze 
Cirolanidze 
| Corallanidze 
| Alcironidse 
Flabellifera . f “ 7 ° . / Barybrotidse 
Aigidee 
Cymothoidz 
Serolidze 
Spheromidz 
Limnoriide 
f Arcturidz 
* | Idoteide 
, J Asellidze 
Asellota. . . . > * | Munnopsidze 
Chelifera 3 ° . ‘ 2 { 
Cymothoid 
group 
Valvifera $ : . : E 
Phreatoicidea. : : ; : . Phreatoicidz 
Microniscide 
Cyproniscidze 
| Dajidze 
Epicaridea . ; . , ° . \, Cabiropsidze 
Cryptoniscide 
{pees 
Bopyridz 
Ligiidse 
Tylidz 
Oniscoidea , . : ; ; . , Helleriidz 
| Oniscidz 
Armadillididas 
Suborder 2.—Isopida. 
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 
