. Elementary biology, animal and human. Biology. ADDITIONAL ANIMAL STUDIES 185 food, they are important economically on account of the pearly matter that is found on the inside of their shells. This â is used in making buttons and other articles. In fact, there is a considerable industry in this line along the Missis- sippi River. i&^&^S^ ^feeler Oysters are rni- portant as an arti- cle of food. The oyster &hermen re- ceive annually from "â¢"=i»^''}'^a5^»sS)B»=*' " mouth twenty to thirty mil- ^^^ ^33 _ ^^^ ^^^^_ lions of dollars from these mollusks collected from
. Elementary biology, animal and human. Biology. ADDITIONAL ANIMAL STUDIES 185 food, they are important economically on account of the pearly matter that is found on the inside of their shells. This â is used in making buttons and other articles. In fact, there is a considerable industry in this line along the Missis- sippi River. i&^&^S^ ^feeler Oysters are rni- portant as an arti- cle of food. The oyster &hermen re- ceive annually from "â¢"=i»^''}'^a5^»sS)B»=*' " mouth twenty to thirty mil- ^^^ ^33 _ ^^^ ^^^^_ lions of dollars from these mollusks collected from the oyster beds along the Atlantic Coast. A certain kind of mollusk, known as the pearl oyster, secretes within its shell the pearls of commerce. These are formed of a material similar to that found on the inner layerS of the fresh water mussel. E. Reptiles 140. The turtle. â The body of a turtle may be divided into four regions; namely, head, neck, trunk, and tail. The larger part of a turtle, the trunk, is covered by a shell, and to this shell the bony skeleton is firmly united. The two pairs of legs, however, are freely movable, but can be drawn within the shell for protection. The toes of the feet are armed with sharp, curved nails, and the legs are covered with scales. The legs are used for walking and also for swimming. In some turtles the legs become broad and flat and are of but little use except for swimming. The head, neck, and tail can also be drawn into the shell. Scales cover the neck and part of the head. The jaws of the turtle, often called the beak, possess no teeth. The eyes, protected by the eye- lids, the nostrils, and the ear openings, are readily seen. Turtles reproduce by means of eggs, which are comparatively large. Turtle eggs are often used for food. These animals breathe throughout their entire Ufe by means of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - c
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