302 



PAL^MONID^.. 



DECAPODA. 



MACROURA. 



PALJEMONIDJE. 



COMMON PRAWN. 



Palcemon serratus. 



Specific Character. — Rostrum extending considerably beyond the antennal 

 scale ; turned upwards anteriorly ; bifid at the extremity j above, armed with 

 seven or eight teeth, the anterior third unarmed ; beneath, with five or six 

 teeth. 



Astacus serratus, Penn. Brit. Zool. IV. t. xvi. f. 28, p. 19. 



Cancer squilla, Hekbst. II. t. xxv. f. 1. 



Palcemon „ Latr. Gen. Crust. I. p. 54. — Leach, Edin. Encycl. 



VII. 401. 

 „ serratus. Fabr, Supp. p. 604 — Leach, Trans. Linn. Soc. XI. 



348.— Mai. Brit. XXIV. t. xliii. f. 1-10.— Edw. 

 Hist. Nat. des Crust. II. p. 38.9. 



TiiK carapace of the common prawn is even, rounded, and 

 furnished anteriorly with two points, one above and the 

 other beneath the peduncle of the external antenna ; the 

 rostrum is of great length, the anterior half ascending ; 



