. The Cambridge natural history. Zoology. 132. — Encsphaloides arm- stroiigi, X 1. The long walk- ing legs are omitted. C, Great chela ; G, one of the greatly swollen gill - thambers. (After Alcock.) the gill-chambers (G) greatly swollen and enlarged to make up for the scarcity of oxygen in these deep regions. Fam. 1. Maiidae.—The chelipedes are not much larger than the other legs, but are very mobile. Orbits incomplete. A very large family, including all the true Spider-crabs, very common in the Atlantic and Mediterranean littoral. Inachus, Pisa, Hi/as, Stenorhijnchus, Maia, Encepha- loides (
. The Cambridge natural history. Zoology. 132. — Encsphaloides arm- stroiigi, X 1. The long walk- ing legs are omitted. C, Great chela ; G, one of the greatly swollen gill - thambers. (After Alcock.) the gill-chambers (G) greatly swollen and enlarged to make up for the scarcity of oxygen in these deep regions. Fam. 1. Maiidae.—The chelipedes are not much larger than the other legs, but are very mobile. Orbits incomplete. A very large family, including all the true Spider-crabs, very common in the Atlantic and Mediterranean littoral. Inachus, Pisa, Hi/as, Stenorhijnchus, Maia, Encepha- loides (Fig. 132). Fam. 2. Parthenopidae. — The chelipedes are much larger than Fig. the other legs. Orbits complete. Lamhrus (Fig. 133), Parthenope. Fam. 3. Hymenosomatidae.—The carapace is thin and flat; the cheli- pedes are neither very long nor especially mobile. There are no orbits, and the male openings are on the sternum. Charac- >!^>^^SBi!^l "'^%, V, teristic of the Antarctic seas. Hymenosoma, Trigonoplax. Tribe 5. Catometopa. These Crabs resemble the Cyclometopa in general ap- pearance, but the carapace is very square in outline, and its margins are never so well provided with spines as in the Cyclometopa. The position of the male genital openings is peculiar, since they lie upon the sternum, and are connected with the copulatory appendages upon the abdomen by means of furrows excavated in the sternum. The Catometopa are either littoral or shallow water forms, or else they live entirely on land. The Grapsidae are marine Crabs, Pachygrapsus marmoratus (Fig. 134) at Naples being exceedingly common on rocks at high-water mark, over which it scuttles at a great rate; in the Mediterranean it takes VOL. IV 0. Fig. 133.—Lamhrus miersi, x 1. (After Milne Edwards and Bouvier.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfe
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
