222 POPULAE HISTOKY OF THE AQUARIUM. 



more pointedly and sharply. The eyes are placed on rather 

 large peduncles, have a startled kind of stare, and, if seen 

 by candle-light, reflect a golden glare, like those of a cat. 

 There are two spines on the front of the carapace, which is 

 cylindrical and smooth. Seemingly coming out from un- 

 derneath each eye is a jointed stalk, supporting the internal 

 or superior antennse, each with three filaments, the shortest 

 not so long as the rostrum, but the others long and flowing. 

 On the peduncle of the outer antennae is, on each side, an 

 oval or oblong plate or scale, fringed with hair, from be- 

 neath which the long flowing outer antennae make their 

 appearance. All these antenna! filaments are neatly ringed 

 throughout ; and when the animal is on the watch for food, 

 they are all waving about in every direction. It is quite 

 astonishing how quickly the Prawn detects the presence of 

 any falling scraps in his vicinity. I saw several, when being 

 fed, apprehend minute morsels which they could not have 

 seen, nor even touched with their antennae ; so as to lead to 

 the conclusion that these must be organs of smell. And 

 even when the fragments dropped between pebbles at the 

 bottom, it was wonderful to see how the little two-fingered 

 hands or pincers would dive down and pick them out. In 

 the figure, immediately below the antennae plate, are the 



