202 CRUSTACEANS. 



Colour of the whole animal, different shades of fine yellow. 

 A learned naturalist told me he had seen twelve of these creatures 

 taken from the stomach of a cod. It is not common. 



PLATE LI. 



FIG. 1. Cancer horridus, the Prickly Crab. Back. 



2. Rostrum, natural size. 



3. Antennae. 



4. Apron or thorax, reduced. 



5. Cavity in the shell for accommodating the growing spawn. 



PLATE LII. 



FIG. 1. Cancer horridus, under surface, reduced. 



PART II. 



A.-DECAPODES, TEN-LIMBED, LONG-TAILED, CRUSTACEANS MACROURJ. 



We have been as yet occupied only with that section of the Crustacean 

 animals comprehending the short-tailed crabs or Brachyuri, properly so 

 denominated. All are of aquatic nature ; and although there are some 

 terrestrial Crustaceans in this country, I do not intend to enter on their 

 history at present. 



Such Crustaceans are composed, as we have seen, of one large shell, 

 vernacularly designed the carapace, and a number of slightly articulated 

 segments, proportionally small, and rapidly decreasing, which, compared 

 to lower parts in the organization of some other animals, all terminate in 

 a portion applied to the under surface or breast, and is denominated indif- 

 ferently the thorax, the plastron, or the apron. 



If the whole thorax be relieved of its curvature, and extended as if 

 in a straight line, it appears still very short from the preceding examples. 



Another numerous family of the Crustacean tribe, is denominated 

 Macrouri or long-tailed, comprehending the Astacus or Lobster, and its 

 congenera. 



