THE COMMON SPINY LOBSTER (Palinurus vulgaris). (MUCH REDUCED) (From Brit. Mus. Guide)
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The section Astacura contains only a single tribe, Nephropsidea, formed by the true Lobsters and the fresh-water Crayfishes. They have pincer-claws on the first three pairs of legs, and the first pair are much larger than the others.
The third section of the Reptantia, the Anomura, comprises forms in which the abdomen is variously modified, being either bent upon itself or, if extended, more or less soft and feebly armoured. The last pair of legs are commonly reduced in size, and not used in walking. The members of the four tribes composing the section differ widely in their general appearance.
The Galatheidea ([Plate VI].) are small, flattened, lobster-like animals which have the abdomen bent under the body. In one family (Porcellanidæ) the animals have quite the appearance of little Crabs (see [Fig. 41], p. 113), but they may be distinguished from the true Crabs (Brachyura) by the fact that there are only three pairs of walking legs behind the great chelæ, the last pair of legs being very small and carried folded up at the sides of the body, or even within the gill chambers.
PLATE VI
Munida rugosa. BRITISH. (REDUCED)
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