Plate la. A group of woodlice. Top row. Ligia oceouica, Ligidium hypno- 



rwHy Hemilepistus reaumuri and Ar?fiadillidium ridgare. Bottom row: Oniscus 



asellus, Porcellio scaber, Androuisciis dentiger and Philoscia muscoriuii. 



The halfpenny gives the scale. {Photo: J. L, Cloudsley-Thompson.) 



% <^x>^^ 





Tfl^ 



Plate lb. Ligia oceanica (length 2-3 cm), Platyarthrus hoffmamiseggi 

 (length 3 mm) and Oniscus asellus (length 16 mm). (From Webb and 



Sillem, 1906.) 



