^D. cuprea.^ This is one of the largest and most beautiful annelids. It is found from Cape Cod to South Carolina at low-water mark, in sandy mud-flats, living in long tubes which project above the surface two or three inches and are hung with seaweeds and bits of foreign matter. /Diopatra/ is twelve inches or more in length and one half of an inch in breadth. In color it is reddish-brown, specked with gray, and has a brilliant whitish or opal-like iridescence. The appendages are yellowish-brown, specked with green. The body is flattened. From the fifth segment long, dull to bright red, much-branched gills, resembling plumes, [pg179] extend nearly to the end of the worm. On the ventral side of the parapodia are whitish tubercles with a dark spot in the middle. These papillæ secrete the long, broad tube in which the worm lives. The worm is difficult to capture, for when pursued it retreats quickly into its tube, which is so large that it can easily turn around within it. (Plate XLVIII.) [Illustration: /Diopatra cuprea./ Head and anterior part of body, showing part of the branchiæ; side view.] GENUS ^Arabella^ ^A. opalina.^ Body cylindrical, twelve to eighteen inches long, one quarter of an inch wide in the middle, and tapers to the ends, which are comparatively small; lateral appendages short; color bronze, with brilliant, opal-like iridescence; head small, conical, but blunt and without tentacles; four eyes in transverse row at the base of the head; segments well marked; coils into spirals when outside of its burrow. Found in compact sandy mud at low-water mark on the New England coast. GENUS ^Lumbriconereis^ ^L. tenuis.^ Twelve inches or more long, and slender, like a fine cord; bright red and somewhat iridescent; very fragile. Abundant in sandy mud on the northern New England coast, and found from New Jersey northward. FAMILY ~GLYCERIDÆ~ These worms are long and smooth, with numerous segments. They taper at both ends. The head is small, conical, sharply pointed, and has four very small tentacles. The proboscis, or [pg180] pharynx, when protruded, is very large and long, and appears too large for the worm. The proboscis has four hook-like jaws. These worms burrow rapidly and disappear almost instantly into the mud or sand. [Illustration: /Glycera meckelii/, with pharynx everted.] GENUS ^Glycera^ ^G. americana.^ Color red or purple; has branched gills on upper side of parapodia. Found from South Carolina to Cape Cod on sandy and muddy shores and flats near low-water mark. ^G. dibranchiata.^ Has a simple gill on both sides of the parapodia; about eight inches long and one quarter of an inch wide in the middle; proboscis one inch long and wider than the body on the upper end. Abundant from New Jersey to Cape Cod. ORDER =SEDENTARIA= THE TUBICOLOUS WORMS