Small Crustaceans, with a rudi-mentary abdomen, the first two segments of the thorax amalgamated with the head, and carrying legs. Branchiae. as two or three pairs of vesicles, borne on the thorax. The Laemodipoda are small Crustaceans, which are distinguished amongst the Edrioph-thalmata by the rudimentary condition of the abdomen. The first thoracic segment is amalgamated with the head, and the limbs of this segment appear to be inserted beneath the head, or, as it were, beneath the throat (fig. 153); hence the name given to the order. The respiratory organs are in the form of two or three pairs of membranous vesicles attached to the segments of the thorax, or to the bases of the legs. The last pair of feet are either inserted at the end of the last somite, or are followed by not more than one or two small segments. There are four setaceous antennae, and the mandibles are without palps. The body is generally linear, of eight or nine joints, but is sometimes oval. The feet are hooked. The Laemodipoda are all marine, and one section of the order comprises parasitic Crustaceans, of which the Whale-louse (Cyamus ceti) is the most familiar. The entire order is now generally regarded as being merely a section of the Amphipoda.