] 10 GLAUCUS ; OE, 



crust of stone, pierced, as you see under the mag- 

 nifier, into a thousand cells, each with its living 

 architect within. Here are two sorts : in one the 

 tubular cells radiate from the centre, giving it the 

 appearance of a tiny compound flower, daisy or 

 groundsel ; 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 Darwin's delightful 

 "Voyage of the Beagle," and of "Williams's "Mis- 

 sionary Enterprises," knows, or ought to know, 

 enough about them : for those who do not, there are 

 a few pages in the beginning of Dr. Landsborough's 

 " British Zoophytes," well worth perusal 



