DECAPODA. CRUSTACEA. CRANGON. 331 



rostrum distinguishes it from other American species. Milne- 

 Edwards has unfortunately interchanged the names of this and 

 another species. 



GENUS CRANGON, FABR. 



C. VULGA'RIS. Rostrum not so long as the eyes, with a spine 

 behind it on the thorax, and another on each side ; thorax seven 

 spined ; anterior feet with a spine on the third joint beneath. 



Cancer crangon, SEBA ; Thesaur. iii. pi. 21, f. 8. LIN. ; Syst. Jfat. 



Astacus crangon, HERBST ; Cancr., ii. 75, pi. 29, f. 3. 



Crangon vulgaris, FABR. ; Entom. Syst. Suppl., 410. LATR. ; Crust. ,\ vi. 267, 



pi. 55, f. 1, 2. LEACH ; Malacol Pod. Brit., pi. 37 B. MILNE-EDW ; Hist. Nat. 



des Crust., ii. 341. 

 Crangon septemspinosus, SAY ; Journ. Acad. Nat. Sc., i. 246. 



This is the common Shrimp, of which vast multitudes are used 

 on the coasts of England and France for food. Mr. Say thought 

 the number of spines on the thorax differed from that on the trans- 

 atlantic animal ; and he therefore gave it a new name. But I 

 have had an opportunity of examining foreign specimens which do 

 not differ from ours ; neither do the best figures and descriptions. 



It is more plentiful about the ocean shores than within Massa- 

 chusetts Bay ; and it is nowhere sufficiently abundant to make 

 it an object to collect it for food. It may be usually found, 

 however, by searching the little pools left upon the flats at low 

 tide. 



C. BO'REAS. Carapax spiny; the second and third pairs of 

 legs filiform. 



Cancer boreas, Phipps's Voyage, 194, pi. 11, f. 1. 

 Cancer homaroides, FABR. ; Fauna Grcenl.,241. 

 Astacus boreas, OLIV. ; HERBST; Cancr., ii. 73, pi. 29, f. 2. 



Crangon boreas, LAM. ; An. sans Vert., v. 350. SABINE ; Append, to Parry's 

 Voy., 57. MILNE-EDW. ; Hist. Nat. des Crust., ii. 342. 



This species is larger and broader than the preceding. It is 

 broad about the head, marbled with scarlet, and having several 

 rows of spines on the thorax. I have taken several specimens 

 from the maws of cod-fish, but have never seen it alive. 



