MALACOSTRACA. DECAPODA. 289 



itself to fresh-water, inhabiting the streams and 

 lakes of Europe and Northern Asia ; kindred species 

 are found also in North America. It conceals 

 itself under stones, and in holes in the banks, only 

 coming out for food, which consists of Mollusca, 

 small fishes, and decaying animal substances. It is 

 said to live twenty years, increasing all the time. 

 Those which inhabit clear running streams, are 

 better flavoured than those of stagnant ponds. They 

 are taken by sinking faggots of thorns, in the middle 

 of which a mass of putrid flesh is placed. They are 

 also caught by torch-light.* 



Crangon^ the Shrimp. 



The single species of this genus, which is of small 

 size, has a single hooked claw, in place of the first 

 pincers ; the upper antennae have but two threads ; 

 the spine of the forehead is short, the shell is horny, 

 thin, and semi-transparent. The Shrimp which is so 

 largely consumed in this country, (C. Vulgaris,) 

 swarms in immense hosts on most sandy beaches. 

 In Paley's Natural Theology, we have a very inter- 

 esting notice of this species. " Walking," says the 

 Dr., " by the sea-side on a calm evening, upon a 

 sandy shore, and with an ebbing tide, I have fre- 

 quently remarked the appearance of a dark cloud, 

 or rather, very thick mist, hanging over the edge of 

 the water, to the height perhaps of half a yard, and of 



* Partington's Brit. Cycl. Art. CRAY- FISH." 

 f Its ancient Greek name. 

 VOL. II. O 



