. Zoology : for students and general readers . Zoology. Pig. llZ.— Clidiopfiora trilineata, na- tural size.—After Verrill. Pliolas and Petricola. said to be Fig. YlZ.—Glydmeris siliqua, tiataral size.—After Morse. A very aberrant form of bivalve moUusk is Clavagella, in which the shell is oblong, with flat valves, the left cemented to the sides of a deejD burrow. The tube is cylindrical, fringed above and ending below in a disk, with a minute central fissure, and bordered with branching tubules. In Aspergillum, the watering-pot shell, the small bivalve shell is cemented to the lower
. Zoology : for students and general readers . Zoology. Pig. llZ.— Clidiopfiora trilineata, na- tural size.—After Verrill. Pliolas and Petricola. said to be Fig. YlZ.—Glydmeris siliqua, tiataral size.—After Morse. A very aberrant form of bivalve moUusk is Clavagella, in which the shell is oblong, with flat valves, the left cemented to the sides of a deejD burrow. The tube is cylindrical, fringed above and ending below in a disk, with a minute central fissure, and bordered with branching tubules. In Aspergillum, the watering-pot shell, the small bivalve shell is cemented to the lower end of a long shelly tube, closed below by a perforated disk like the "rose" of a watering- pot. The most aberrant Lamellibranch is the ship-worm, Teredo navalis Linn. (Fig. 179). This sjiecies is now cosmopolitan, and everywhere attacks the hulls of shijos and the piles of wharves. It is one of the most destructive to human inter- ests of all animals. The body is from one to two feet long, slender, fleshy; it lives in a burrow lined with limestone, while the shell itself is globular, and lodged at the farther. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
