In southern waters and on the Pacific coast, the place of the lobster is taken by the crayfish, or spiny lobster (Fig. 145). The resemblance to the lobster is almost exact with this exception: instead of large biting claws, the latter are but slightly larger than the ordinary claws, ending with a sharp point, while the antennæ or feelers are enlarged to an extraordinary degree, becoming highly serrated and defensive organs in every sense. The Florida crayfish is a rich reddish yellow, mottled color, while the California form is a greenish yellow. On the Florida Reef almost every coral branch or coral head hides a crayfish, the whips being seen waving to and fro. This is their day retreat, but at night they wander forth to feed in the luxuriant pastures of Algæ, or seaweeds, of various kinds found in the lagoons. By going out early in the morning, before sunrise, I have often surprised the crayfishes, the bottom being covered with them, massive fellows weighing eight or ten pounds. They are not so delicate in flavor as the lobster, but are very valuable as bait. The lobster and the Pacific crayfish are both canned, the industry being an important one. [Illustration: FIG. 145.--Crayfish or spiny lobster.] The prawns (Fig. 146) and shrimps are well known and valuable members of this group, swarming in the same waters, and among the most graceful of the tribe. Many are absolutely transparent, the large black eyes alone being seen. The chameleon shrimp is noted for its rapid changes of color, green, brown, and reddish hues following each other over its crystallike body. In the deeper waters marvelous shrimps have been found, nearly all a dazzling red. Some of the East Indian shrimps are giants two feet in length. In England horses are employed to catch shrimps. A large dragnet is set in shallow water to which the horse is fastened, the fisherman, mounted, driving the animal over the shallow flats, hauling the nets inshore. [Illustration: FIG. 146.--_A_, prawn; _B_, claw enlarged.]