The warlike group which struck us so forcibly had gathered rapidly from all parts of the pool upon a piece of flat table-rock that jutted out high up. Some unexplained excitement agitated the host; their innumerable spear-like antennae moved ceaselessly. From above a ray of light fell just upon the table-rock where they were gathered, making the waving spears glitter like the bayonet points of a body of troops, and forming a striking contrast with the dark cliffs and overshadowed water below, from which stragglers were quickly gathering, some paddling across the deep pool, others scrambling up the rocks, and all with the same fierce and restless expression. How I longed for a chance of sketching the scene! Prawns are not quite such colourless creatures in the sea as they are here. Why they lose their colour and markings in captivity is not known. They seem otherwise well. They are hungry creatures, and their scent is keen. The shrimps keep more out of sight; they burrow in the sand a good deal. You know one has to look for fresh-water shrimps in a brook if one wants to find them. In Tank 18 are our old friends the hermit-crabs. As a child, I think I believed that these curious creatures killed the original inhabitants of the shells which they take for their own dwelling. It is pleasant to know that this is not the case. The hermit-crab is in fact a sea-gentleman, who is so unfortunate as to be born naked, and quite unable to make his own clothes, and who goes nervously about the world, trying on other people's cast-off coats till he finds one to fit him. They are funnily fastidious about their shells, feeling one well inside and out before they decide to try it, and hesitating sometimes between two, like a lady between a couple of becoming bonnets. They have been said to be pugnacious; but I fancy that the old name of soldier-crabs was given to them under the impression that they killed the former proprietors of their shells. With No. 18 the window tanks come to an end. In two other rooms are a number of shallow tanks open at the top, in which are smaller sea-anemones, star-fish, more crabs, fishes, &c., &c. Blennies are quaint, intellectual-looking little fish; friendly too, and easy to be tamed. In one of Major Holland's charming papers in _Science Gossip_ he speaks of a pet blenny of his who was not only tame but musical. "He was exceedingly sensitive to the vibrations of stringed instruments; the softest note of a violin threw him into a state of agitation, and a harsh scrape or a vigorous _staccato_ drove him wild." In Tank 34 are gurnards, fish-gentlemen, with exquisite blue fins, like peacock's feathers.