Dodecaceria fewkesi Berkeley & Berkeley 1954

Berkeley & Berkeley (1954) "D. fewkesi constructs and lives in calcareous tubes built in masses on rock faces which are usually more or less vertical, but this is not invariably the case. The tubes are fused together on a common base from which the upper ends project freely for a distance of anything up to approximately half an inch. The anterior portion of the tubes and their mouths are roughly circular and 1 to 3 mm. in diameter, but often two or three adjacent tubes are fused, making irregular terminations (Figure f ). The tube masses vary considerably in shape and size and usually occur in distinct colonial formations, but fusion of adiacent masses frequently takes place and a rock face may be more or less completely covered. They are found only in fairly rapidly moving, well aerated, water and only in the intertidal area, from the lowest to about mid-tide mark. When covered with water, the worrns extend the first few body-segments and spread their branchiae and tentacular cirri, which are kept in constant motion, but they withdraw into their tubes at the fall of the tide or if disturbed." Blake (1996:374) describes the tube masses as "hardened rock-like structures that are riddled with tubes and attached to boulders and other hard surfaces in the intertidal ..."