. Sea-shore life; the invertebrates of the New York coast. Marine animals. 128 SEA-SHORE LIFE of wood, excepting palmetto logs or teak. The ship-worm begins to burrow into the wood by movements of its foot and shell, when onl\' as large as a pin's head, so that the opening to the burrow is small. For a short distance from the entrance inward the bur- row is apt to be perpendicular to the surface, but it soon turns and runs more or less in the direction of the grain of the wood, although usually quite twisted. The burrow is lined with shelly material secreted by the teredo, and it is interestin
. Sea-shore life; the invertebrates of the New York coast. Marine animals. 128 SEA-SHORE LIFE of wood, excepting palmetto logs or teak. The ship-worm begins to burrow into the wood by movements of its foot and shell, when onl\' as large as a pin's head, so that the opening to the burrow is small. For a short distance from the entrance inward the bur- row is apt to be perpendicular to the surface, but it soon turns and runs more or less in the direction of the grain of the wood, although usually quite twisted. The burrow is lined with shelly material secreted by the teredo, and it is interesting to observe that no matter how numerous the teredos infesting a piece of wood, their tubes remain separate one from another and never intersect. The shelly material lining the tube is not the true shell of the teredo. The true shell is found at the head-end of the body which is farthest in from the opening to the burrow. Its two valves are small, white and delicately sculptured. The long, worm-shaped body is yel- lowish-white and tapers gradually to the posterior end which is near the opening of the burrow. The two long, extensible siphons are found here; and on both sides near their base are a pair of. Fig. SS; SHIP-WORM witli SU^HONS PIlUTRUDIMl. From living specimens infesting wood in tile New York Aquarium, shelly flappers which serve to close the opening of the burrow when the siphons are withdrawn. A thick muscular collar at the base of the flapper also assists in closing the opening. The teredo does not eat the wood into which it bores and is, therefore, but little affected by poisoning the timber. The most efficient protection is copper sheating. Species of teredo are widely distributed and do enormous damage to submerged timber. Tere-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mayor, Alfred G
Size: 2424px × 1031px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpu, booksubjectmarineanimals
