Manchester Memoirs, Vol. Iviii. (191 3), No. \. 9 



III. Fresh water acts far more rapidly than sea-water, 

 and this would seem to indicate that Ligia, 

 although it spends most time in terrestial sur- 

 roundings, possesses a considerable adaptability in 

 regard to immersion in sea-water, which is pro- 

 bably indispensable in an animal whose habitat 

 so closely adjoins the sea. 



LIST OF AUTHORITIES QUOTED. 



(1) Bate & Westvvood (1863-68). "A History of the British 



Sessile-Eyed Custacea." 



(2) I)KLAt;E (1881). "Contribution a Tetude de I'appareil 



circulation des Crustaces Edriopthalmes marins." {Arch. 

 Zoo/, exper., T. IX., 1881.) 



(3) Hewitt, C. G. (1907). "Ligia." Z. M. B. C. Memoir. 



(4) Unwin, E. E. (1909). 'Respiration of Land Isopods." 



{London Rep. of the Brit. Ass.) 



(5) Webb & Sillum (1906). "British Woodlice." 



