'The means of comminuting the food are not restricted to the complicated machinery above referred to, for the stomach itself contains a very remarkable apparatus, consisting of several hard calcareous pieces, which may be termed _gastric teeth_. They are attached to horny or calcareous levers, fixed in the parietes of the stomach; they are moved by a complicated system of muscles, and are admirably adapted to complete the thorough breaking-down of the aliment, which had already been to a considerable extent affected by the buccal appendages. These gastric teeth may be readily seen and examined in the larger species of Decapoda, as in the large eatable crab and the lobster; and it will be readily perceived how perfectly the different pieces are made to act upon each other, and to grind the food interposed between them.' Having been on a certain day at the sea-side collecting, I was amused to observe the movements of two ragged little urchins, who approached near to where I stood, bottle in hand, examining some beautiful zoophytes by aid of a pocket lens. One of them had a short iron rod, with which he very dexterously hooked out any unfortunate crab who happened to have taken up its quarters in some crevice or beneath a boulder. Having captured a specimen, it was handed over to his companion, who quickly tied it to a string which he held in his hand. I had seen many a rope of onions, but this was the first time I had seen a rope of crabs. On inquiry, I learned that the boys had taken two dozen animals in about two hours. When any of the green-bellied crabs happened to be poked out, they were allowed to escape back again as quickly as they pleased. With poor _Cancer pagurus_ the case was different,--every specimen, as soon as caught, being strung up, and doomed to 'death in the pot.'