266 CRUSTACEA, ECHINOVERMS, ETC. 



of their feet. When thus hiding, the speckled light 

 grey colour 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. 



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Fig. 197. 



Hippolyte varians. Banded Shrimp (Crangonfasciatus}. 



red colour at will ; the banded shrimp (Crangon 

 fasciatus) ; and the night-walker (Nika edulis). 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 



