Running wheels which enable the end carriages to travel on the longitudinal gantry girders or runway, and the crab or jenny, which carries the hoisting mechanism, and moves across the span on FIG.
Polyphemus) is common on the coasts of the United States, and is known as the king-crab or horse-shoe crab.
It and the crab are FIG.
The so-called foxes of South America, such as the crab-eating fox (C. thous), Azara's fox (C. azarae), and the colpeo (C. magellanicus), are aberrant members of the typical genus Canis.
The irritation is caused by the rostrum of the insect being inserted into the skin, from which the blood is rapidly pumped up. A third human louse, known as the crab-louse (Phthirius pubis) is found amongst the hairs on other parts of the body, particularly those of the pubic region, but probably never on the head.
Japanese rivers and lakes are the habitation of severalseven or eightspecies of freshwater crab (kani), which live in holes on the shore and emerge in the day-time, often moving to considerable distances from their homes.
Milne Edwards has identified ten species which occur in Australian seas also, and Rein mentions, as belonging to the same category, the helmet-crab or horse-shoe crab (kabuto-gani, Limulus longispina I-Ioeven).
The forward motion is given by a chain winding upon a crab placed in front, by which it is hauled slowly forward.
Of Lexington), Harrodsburg, Crab Orchard in Lincoln county (about 115 m.
This latter route began at Inglis's Ferry, on the New river, in what is now West Virginia, and proceeded west by south to the Cumberland Gap. The " Wilderness Road," as marked by Daniel Boone in 1775, was a mere trail, running from the Watauga settlement in east Tennessee to the Cumberland Gap, and thence by way of what are now Crab Orchard, Danville and Bardstown, to the Falls of the Ohio, and was passable only for men and horses until 1795, when the state made it a wagon road.
However different in structure Trilobites may be, they all agree in possessing a head-shield usually semi-circular in shape, which results from the fusion of apparently five segments, and bears, except in some blind forms, a pair of large reniform compound eyes like those of the king-crab (Xiphosura).
From a careful series of experiments made in the Horticultural Society's Garden at Chiswick, it was found that where the soil is loamy, or light and slightly enriched with decayed vegetable matter, the apple succeeds best on the doucin stock, and the pear on the quince; and where it is chalky it is preferable to graft the apple on the crab, and the pear on the wild pear.
- For the present, as of old, the true Brachyura are divided into four tribes: Cyclometopa, with arched front as in the common eatable crab; Catometopa, with front bent down as in the land-crabs and the little oyster-crab; Oxyrhyncha, with sharpened beak-like front as in the various spider-crabs; Oxystomata, including the Raninida, and named not from the character of the front but from that of the buccal frame which is usually narrowed forwards.
Modern research has discovered no crab to surpass Macrocheira hampferi, De Haan, that can span between three and four yards with the tips of its toes, but at the other end of the scale it has yielded Collodes malabaricus, Alcock, "of which the carapace, in an adult and egg-laden female, is less than one-sixth of an inch in its greatest diameter."
Among the Pagurinea is the Birgus latro, or robber-crab, whose expertness in climbing the coco-nut palm need no longer be doubted, since in recent years it has been noted and photographed by trustworthy naturalists in the very act.
That a wood-louse and a land-crab are alike Malacostracans, and that they have by different paths alike become adapted to terrestrial life, are facts which even a philosopher might condescend to notice.
Certain waterfleas (Cladocera) fall short of one-hundredth of an inch in total length; the giant Japanese crab (Macrocheira) can span over Io ft.
Swimming is perhaps the commonest mode of locomotion, but numerous forms have taken to creeping or walking, and the robber-crab (Birgus latro) of the Indo-Pacific islands even climbs palm-trees.
Sometimes the one partner affords the other merely a convenient means of transport, as in the case of the barnacles which grow on, or of the gulf-weed crab which clings to, the carapace of marine turtles.
A, Group of Peltogaster socialis on the abdomen of a small hermitcrab; in one of them the fasciculately ramified roots, r, in the liver of the crab are shown (Fritz Muller).
4), or, finally, the penultimate segment may be produced into a thumb-like process opposed to the movable terminal segment or finger, forming a perfect chela or forceps, as, for instance, in the large claws of a crab or lobster.
These spaces make up the apparent body-cavity, the ta, Stomach of common crab, true body-cavity or coelom having Cancer pagurus, laid open, been, for the most part, obliter showing b, b, b, some of the ated by the great expansion of calcareous plates inserted in the blood-containing spaces.
- Gastric Teeth of Crab and Lobster.
- Side view of Crab, the abdomen extended and carrying a mass of eggs beneath it; e, eggs.
- Zoea of Common Shore-Crab in its second stage.
It was a great horseshoe crab--the first one I had ever seen.
I would not leave Miss Sullivan in peace until she had put the crab in a trough near the well where I was confident he would be secure.