. Circular. Agriculture; Agriculture; Entomology. The European Pileworm, a Dangerous Marine Borer 9 layer of white shell which acts as a further protective covering for the animal, and also prevents any injury to the soft part of the body through contact with splinters of wood. The burrows of older borers are quite heavily lined with smooth white shell. It is an interesting fact that no matter how closely the marine borers may be crowded together, their burrows never run into each other, though the walls of wood separating them may be thin as tissue paper (fig. 6). Pileworm Breeds Rapidly An a
. Circular. Agriculture; Agriculture; Entomology. The European Pileworm, a Dangerous Marine Borer 9 layer of white shell which acts as a further protective covering for the animal, and also prevents any injury to the soft part of the body through contact with splinters of wood. The burrows of older borers are quite heavily lined with smooth white shell. It is an interesting fact that no matter how closely the marine borers may be crowded together, their burrows never run into each other, though the walls of wood separating them may be thin as tissue paper (fig. 6). Pileworm Breeds Rapidly An astonishing fact in the life of the pileworm is the rapidity with which it becomes sexually mature and begins to breed. The oyster in New Jersey does not usually breed until it is 2 years old, while clams. Fig. 6. Pieces of Cypress From Platform Riddled by the Burrows of Teredo navalis Note the white shell which lines the burrows require from 1 to 2 years to reach breeding age. As compared with this, Potts (6) found at Samoa, in the Pacific Ocean, with tempera- tures of the water ranging from 80 to 86° F., that Teredo navalis be- came sexually mature within 24 days of the time it entered the wood. The shallow coastal waters of this state are often warmed to 80° F. and above, during the summer, so that growth almost as rapid may occur here. In Barnegat Bay, N. J., breeding teredos have been found in less than 6 weeks from the time they attached themselves to the wood, and when they averaged only 3/5 inch in length. In Teredo navalis the eggs are fertilized within the gills of the female by spermatozoa thrown out through the excurrent siphon of a nearby male, and enter- ing with the stream of water passing into the incurrent siphon of the. 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 New Jersey Agricultura
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Keywords: ., bookcentury1900, booksubjectagriculture, booksubjectentomology
