Plan of the Powder Hole, Monomoy Point, Mass., showing the shellfish experiments and laboratory of the Massachusetts Department of Fisheries and Game. The harbor, represented by the dotted lines, is bounded on the north and west by a clam flat of coarse sand. The channel connecting the Powder Hole with the ocean passes across this flat. The deepest water, 18 feet, is found near the clam flat, while in the eastern and southern parts of the harbor the shallow water is filled with a thick growth of eelgrass. (1) Raft; (2) car in which egg lobsters were confined for hatching purposes; (3) scallop pen; (4) scallop pen; (5) scllop pen; (6) winter rack for suspending scallop baskets and quahaug boxes under water as a protection from the ice; (7) quahaug bed No.3; (8) quahaug bed no.5; (9) quahaug bed no. 7; (10) quahaug bed No.6; (11) quahaug bed No.8; (12) clam bed No.19; (13) sea clam bed; (14) clam bed No.18; (15) clam bed No.3; (16) clam bed No. 2; (17) clam bed No. 99; (18) clam bed N
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