insects. He is a curious connecting-link between the spiders and insects, and, though harmless with us, the family is much dreaded from its poisonous bite in tropical countries. You may also find a harmless member of another notoriously poisonous branch of the spider family—the scorpions. It is a very tiny fellow, with a body scarcely ⅛in. in length; the same formidable nippers of the scorpion, but devoid of the lengthened stinging tail. It is fitly named a pseudo-scorpion—Obisium, sp. Most of the Crustaceans are water-animals, only a few having adopted the dry land as a habitat; and then it is usually in damp shady places that we find them. I think of the land Crustaceans the best known to most of us is the common slater, or woodlouse. Now, you never find a wood-louse in dry open ground; it is always under some form of shelter—firewood, old sacks, dead leaves (or the living masses of our garden plants), always under something that gives dampness and coolness. In the Sturm's Gully mould you will find two species—one the familiar, dull, armoured imported slater, the other a smoother, shinier animal, a native species. Like the shells, one may follow the family out to the habitat of their primal ancestor, the sea. The slater-pauses under the stones at the gully's mouth, and goes no further seaward; but under the rocks that are splashed by the spray of high tide you will find a slimmer more active member of the slater family, with the shining armour of the native slater, but with long antennæ drooping backwards over its segments and a pair of tail-like appendages nearly the length of the body. Lastly, in the pools left by the tide on the shores of the Inner Harbour, and working right up into the brackish water of the sea-creeks, is a pretty little yellow Crustacean, broader, shorter, and shallower than either of these others, whose hinder segments are furnished with lobes, with which it swims with considerable rapidity. It curls itself up into the same protecting roll as do its land representatives. Of the crabs proper we have the countless hosts of little brown-green fellows that haunt the shallows of the harbour, besides numerous species on the open coast. About the handsomest of these last is a great purple-and-pink fellow that you may see occasionally as he vanishes with a rattle of arms into the rugged caves of the tide-touched limestone boulders of the Sturm's Gully beach. It is a far cry from the vertebrate rat to the invertebrate crab that he devours, and from the crab to the primal life-form as a blob of jelly is farther still, so I will leave the lower forms for another paper by abler hands than mine.