122 GLAUCUS; OR, 
exterminated everywhere else by his sturdier brown 
cousin of the Hanoverian dynasty. 
Look, now, at these tiny saucers of the thinnest 
ivory, the largest not bigger than a silver three- 
pence, which contain in their centres a milk-white 
crust of stone, pierced, as you see under the mag- 
nifier, into a thousand eells, each with its living 
architect within. Here are two kinds: in one the 
tubular cells radiate from the centre, giving it the 
appearance of a tiny compound flower, daisy or 
eroundsel; in the other they are crossed with 
waving grooves, giving the whole a peculiar fretted 
look, even more beautiful than that of the former 
species. They are Tubulipora patina and Tubulipora 
hispida ;—and stay—break off that tiny rough red 
wart, and look at its cells also under the magnifier: 
it is Cellepora pumicosa; and now, with the 
Madrepore, you hold in your hand the principal, at 
least the commonest, British types of those famed 
coral insects, which in the tropics are the architects 
of continents, and the conquerors of the ocean 
surge. All the world, since the publication of 
