by 
Anonymous
ANSWERS: 1
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In crustaceans, as well as other arthropods, the circulatory system is of the open type in which blood is not confined to tublar vessels but enters expanded sinuses comprising the hemocoele which largely replaces the coelom. Beneath the connective on each side is a small, rounded structure, the green gland, which is excretory in function. Its opening to the outside on the basal segment of the antenna has already been observed. The gland is complex in structure, in part tubular and with a bladder-like portion that is a coelomic sac.
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