Bulletin, Gulf Biologic Station . r is often covered withseveral Purpura and there are others waiting around, workingto get their foot into it. The drill like its cousin, the Lunatia, is seldom if ever foundin localities where oyster raising is the most profitable. They arenot found in the brackish wat^r of our inland lakes. In fact,they are seldom seen in water under density. They are,however, a source of annoyance on all of the transplantinggrounds. There is no practical method of getting rid of numbers may, however, be diminished by working over thebeds and separating the
Bulletin, Gulf Biologic Station . r is often covered withseveral Purpura and there are others waiting around, workingto get their foot into it. The drill like its cousin, the Lunatia, is seldom if ever foundin localities where oyster raising is the most profitable. They arenot found in the brackish wat^r of our inland lakes. In fact,they are seldom seen in water under density. They are,however, a source of annoyance on all of the transplantinggrounds. There is no practical method of getting rid of numbers may, however, be diminished by working over thebeds and separating the drill into a recepticle and throwing themon dry land in summer and removing them to fresh water inwinter. In summer, the heat of the sun is sufficient to kill them,before they can find their way back to the water, even if onlya few feet distant. The Drum-Fish.—This dreaded pest of our waters is foundin the salt water everywhere on the coast, and often wanders upinto the brackish streams, either unintentionally, or in search of. XI.—OYSTKK .SHKJ^l^ represent the type of shell produced by an oyster raised on a soft,muddy bottom, where the sediment is continually being stirred up. Note thestreaks of sediment along the edge of the shell, that have been discarded bythe oyster. This condition cannot help but retard the growth of the streaks of sediment would be washeid away were the current strongenough. Biit where they are not carried off, they, being irritating to the man-tle of the , are continually being covered over with new layers of shell,till the condition is reached, as shown in the upper right-hand figure, wherethe streaks are almost obliterated, and the water, having remained clear forsome time, no new streaks have been produced. 25 food. The traces of its ravages are evident. The tips of theoyster shells are broken off, as if they had been chiseled with acold chisel. These fish are especially partial toward oysters thathave been freshly bed
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