LiEMODIVODA. 213 



rows divaricating at a rather wide angle. Froin the sudden 

 clutchings of these organs I have no doubt that they too 

 are seizing prey ; and very effective implements they must 

 be, for the joints bend down towards each other, and the 

 long rows of spines interlacing must form a secure prison, 

 like a wire-cage, out of which the jaws probably take the 

 victim, when the bending in of the antennse has delivered 

 it to the mouth. But these well-furnished animals are 

 not satisfied with fishing merely at one station ; they climb 

 nimbly and eagerly to and fro, insinuating themselves 

 among the branches, and dragging themselves hither and 

 thither, by the twigs, on a straight surface. When march- 

 ing (the motion is too free and rapid to call it crawling) 

 along the stem of a zoophyte, the creature proceeds by 

 leaps, catching hold with the fore limbs, and then bringing 

 up the hinder ones close, the intermediate segments of the 

 thin body forming an arch, exactly as the caterpillars of 

 the geometric moths do. But the action of the Crustacean 

 is much more energetic than that of the caterpillar.- In- 

 deed, all its motions strike one as peculiarly full of vigour 

 and energy. I have seen the large red species swim, throw- 

 ing its body into a double curve like the letter S, with the 

 head bent down, and the hind limbs turned back, the body 



