242 



ASTACIDJ3. 



DECAPODA . 

 MACROURA. 



ASTACIDM. 



LOBSTER. 



Homarus vulgaris. Edw. 



Specific Character. Rostrum extending beyond the peduncle of the external 

 antennae, armed with two or three strong teeth on each side, without teeth on 

 its under surface. 



Cancer gammarus^ 



Astacus marinus, 





 Homarus vulgaris, 



LINN. Faun. Suec. 2033. Syst. Nat. Herbst. II, p. 42, t. 



XXV. 



FABR. Suppl. 406. PENN. Brit. Zool. IV. t. x. f. 21. 



LATR. Hist. Nat. des Crust. VI. p. 233. 



EDW. Hist, des Crust. II. p. 334. COUCH, Corn. Faun. 



THE body is thick and rounded ; the cephalo-thorax 

 deeper than it is broad, somewhat compressed at the 



