ATIIANAS NITESCENS. 



281 



DEC APOD A. 



MACROURA. 



ALPHEADM. 



" Canocr (Astacus) nitescens, 

 Palcemon 



Atltanus 



Athanas nitescens. 



MONTAGU, MSS." LEACH. 



LEACH, Edin. Encycl. VII. p. 401. 



Id., p. 432. Trans. Lin. Soc. XI. p. 349. 



Encyc. Brit. Suppl. I. p. 421. Mai. Brit. t. 



xliv. EDW. Hist, des Crust. II. p. 366. 



THE carapace in this remarkable little creature is very 

 smooth, narrowed anteriorly ; the rostrum about half its 

 length, and not extending backwards in a ridge, perfectly 

 simple and pointed. The external antennse have a cylindri- 

 cal peduncle about as long as the scale ; the latter is nearly 

 oval, hairy on the inner and anterior margin, and with a 

 little tooth on the anterior and outer angle. The internal 

 antennae have a thick rounded peduncle, terminating in 

 three filaments, the shortest of which is not much more 

 than one-third the length of the longest, and much thicker. 

 The first pair of legs is large and robust in proportion to 

 the size of the animal, and the hand is particularly so : the 

 second pair is very slender ; the wrist formed of several 

 joints ; the hand very minute and didactyle. The remain- 



