222 FISHES FOR THE MARINE AQUARIUM. 



the opossum shrimp it opens its mouth, and inflates 

 its cheeks so as to cause an in-rush of water, down 

 which the unfortunate crustacean is engulphed. The 

 opossum shrimp may be seen swarming in the water 



Fig. 152. 



Opossum Shrimp (Afysis chameleon}. (Three times natural size.) 



'- '53- 



Tail of Opossum Shrimp with oloconia. a. oloconia. 

 (Magnified ten times.) 



of most rock-pools. It is a queer little object, with 

 the very singular peculiarity of being able to hear by 

 its tail, at the base of which are certain cavities filled 

 with crystalline otoconia, or " ear-bones." 



