1874 THE STORY OF THE UNIVERSE 



rocks, only sprinkled with salt-spray in spring-tides 

 and high gales, have their peculiar little univalves, 

 their crisp lichen-like sea-weed, in myriads; lower 

 down, the region of the Fuci (bladder-weeds) has 

 its own tribes of periwinkles and limpets; below 

 again, about the neap-tide mark, the region of the 

 Corallines and Alga? furnishes food for yet other 

 species who graze on its watery meadows; and be- 

 neath all, only Uncovered at low spring-tide, the 

 zone of the Laminariae (the great tangles and ore- 

 weeds) is most full of all of every imaginable form 

 of life. 



CRABS, PRAWNS, AND LOB- 

 STERS. PHILIP HENRY GOSSE 



IF you look at the head of a crab, a lobster, or a 

 prawn, you will see that it is furnished with 

 jointed antennae, like that of insects; but whereas in 

 insects there is never more than a single pair, in the 

 creatures of which I am speaking there are two pairs. 

 In the prawn you may suppose, at first sight, that 

 there are four pairs; but that is because the internal 

 antennas terminate each in three many-jointed bris- 

 tles, in structure and appearance exactly like the 

 bristles of the outer pair, two of the three being 

 nearly as long as the outer, while the third is short. 

 In the lobster, the internal are two-bristled, both bris- 

 tles rather short, while the external are very long. 

 In the flat-crabs each pair is simple, the inner mi- 

 nute, the outer long. In the great eatable crab each 

 pair is very small, and they are dissimilar. 



