228 



THALASSINAD^. 



DEC A POD A. 



MACROURA, 



THALASS1NADJE. 



Axius Stirynchus. 



Axius Stirynchus, LEACH, Trans. Lin. Soc. XI. p. 343. Mai. Brit. t. xxxiii. 

 DESMAR, Consider, sur les Crust, t. xxxvi. fig. 1, p. 

 207. GUER. Icon. Crust, t. xviii. fig. 5. EDW. Hist. 

 Nat. Crust. II. p. 311. 



THE carapace in this species is nearly semi-cylindrical, 

 but somewhat compressed at the sides ; the gastric region 

 punctate, scabrous ; the rostrum short, elongate-trian- 

 gular, having a raised margin and a raised longitudinal 

 median line. The first abdominal ring very short, fur- 

 nished with a pair of rudimentary false feet ; those of the 

 four succeeding rings are fully developed, natatory, com- 

 posed of a short and thick peduncle, which bears at its 

 extremity a small styliform appendage, and two large oval 

 laminae, having the margins ciliated ; the terminal segment 

 is elongate-triangular ; and the two pairs of lateral caudal 



