266 CRUSTACEA, ECHINODERMS, ETC. 



of their feet. When thus hiding, the speckled light 

 grey dolour of their bodies is admirably adjusted 

 to the appearance of the floor. Among other aqua- 

 rian crustaceans, some of them lower in organisation 

 than those we have just mentioned, and others of 

 which are more or less nearly related, may be 

 mentioned the opossum shrimp ( Mysis ; the Hip- 

 polyte, an animal which assumes a bright green and 



Fig. 196. 



Fig. 197- 



Hippolyte variant. 



Banded Shrimp (Crangon fascia ius). 



red colour at will ; the banded shrimp (Crangon 

 fasciatus) ; and the night-walker (Nika eduiis). The 

 banded shrimp is occasionally sold among the oft- 

 times miscellaneous mixture which goes by the name 

 of "shrimps "; the night-walker has derived its name 

 from its peculiar nocturnal habits. In addition to 

 these may be seen the interesting Gammarus (also 

 frequently sold and eaten as a " cup-shrimp"). No hen 

 could exceed in anxiety for her chicks, the maternal 



