. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . oth, is quadrate in form, is abouttwo inches long and broad, has two spines on each side, and has a promi-nent denticulated rostrum. This is the most common spider-crab of thePacific (California) coast. It is olive-green, thus simulating in color thekelp among which it lives. (See page 285.) GENUS PitJio P. aculeata. The carapace has six spines on each side, the middletwo being sometimes partly united; the general outline is pentagonal;the length about one inch. Quite common o
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . oth, is quadrate in form, is abouttwo inches long and broad, has two spines on each side, and has a promi-nent denticulated rostrum. This is the most common spider-crab of thePacific (California) coast. It is olive-green, thus simulating in color thekelp among which it lives. (See page 285.) GENUS PitJio P. aculeata. The carapace has six spines on each side, the middletwo being sometimes partly united; the general outline is pentagonal;the length about one inch. Quite common on the Florida coast.(Plate LXIII.) GENUS Lambtus L. pourtalesii, the long-armedspider - crab. Thecarapace is broaderthan it is long andhas three elevationsall covered withspines. The generalsurface is pitted andgranulated; the ros-trum points down-ward ; the chelipedsare very long, themargins armed withspines; the breadthof the carapace isabout one and a half inches; and the length of the chelipeds is about three and a half inches. Its range is from Cape Cod to Florida, and it lives among the rocks, (Plate LXIV.). Lambrus pourtalesii. BOX- AND OYSTER-CRABS 287 FAMILY CALAPPIDJEGENUS Calappa C. jfatnnifi, the box-crab. This singular animal lives on sandy andmuddy bottoms offshore, from North Carolina southward. The cara-pace is broad and straight on the posterior side, and is curved on theanterior side, nan-owing to the front. The posterior side has promi-nent denticulations. The body is one and a half inches thick, aboutfour to five inches wide, and two to three inches long. The chela arelarge, broad, and flattened, and are so arranged that when flexed theyfit closely together across the front. When folded, and the small legsare withdrawn under the carapace, the animal is shut up as if in a box,and resembles a shell. When in danger it closes its doors, as it were,and abandons itself to the waves, which often carry it ashore. Thecrested claws resemble the head of a cock. (Plate
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