a genus of animals belonging to the order of vermes mollusca. The body is cylindrical, and fixed to a shell, rock, &c. It has two apertures; one on the summit, the other lower, forming a beak. There are six species of this animal, viz. the papillosum, gelatinosum, intellectalis, quadridentata, rufica, and echinata; only one of which, viz. the rufica *, is found in Plate XLII. of the British seas. Animals of this genus have the faculty of squirting out the water they take in.