they do not go in head first, but stand on the one place, simply turning round and round, as if on a pivot, with their uropods lowered and cutting as they go. They no doubt assist very materially in the disintegration of the rocks, honeycombing them to such an extent that they are easily broken up by the waves into sand, and so contribute to form the rocks of a future geological period. When these Isopods are captured they draw themselves up into a ball, and project their uropods, which are very strong and sharp. Fawn-colour along dorsal line, reddish brown at sides, of somites. Port Jackson.
Sub-order Amphipoda.
Tribe Grammarideæ.
45. Talorchestia quadrimana (Hasw.).—This is the common Sand-hopper, found in great numbers along the whole coast of New South Wales, wherever there are masses of decaying vegetable or animal matter. Length, 7 lines.
