Nearly the same as the Terebella, but of a tougher membranous texture, and generally without adhesions. Amphitrite ventilabrum. A. penicillus. A. magnifica. A. vesiculosa. A. volutacornis. A. infundibulum. _A. ventilabrum._ The Fan Amphitrite. Tube subulate, smooth, of a yellowish colour. FAMILY IV. SERPULACEA. Five genera.