. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . outone hundred and fifty species of Pycnogonida have been described,of which thirty are found on our coast and are commonly knownas sea-spiders. They are found crawling slowly over seaweeds,hydroids, and sponges, and appear to be all legs, but, like otheranimals, have a digestive, a circulatory, and a nervous are devoid of organs of respiration. The body has acephalothorax, which bears a conical suctorial proboscis on theanterior end, and on top a prominence contai
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . outone hundred and fifty species of Pycnogonida have been described,of which thirty are found on our coast and are commonly knownas sea-spiders. They are found crawling slowly over seaweeds,hydroids, and sponges, and appear to be all legs, but, like otheranimals, have a digestive, a circulatory, and a nervous are devoid of organs of respiration. The body has acephalothorax, which bears a conical suctorial proboscis on theanterior end, and on top a prominence containing four eyes. Ithas three pairs of appendages, two pairs of which are sometimeslacking; then come three free segments and a rudimentary abdo-men. There is a pair of short appendages bearing claws (chelae)and four pairs of long walking-legs. The walking-legs containa tubular outgrowth of the body, into which the stomach egg-sacs are in the legs, and open at the basal joints. Themale is provided with an extra pair of legs, for the purpose ofcarrying the eggs after they are deposited by the female. The. PLATE LXIV. (alupjia ]>ourtalesii. C:ilap|i:i (lamina, claws open, showing turiii of polyphemus. SEA-SPIDEE 297 ovigerous legs are run through sac-like pockets and bent underthe body, and thus the eggs are carried until hatched. GENUS P/i oxichilidium P. This species is found on the New England coastcreeping: over hydroids and ascidians. It is purple, gray, or brown incolor. Its young take shelter in the cavities of hydroids, forming galls.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
