First lesson in zoology : adapted for use in schools . water in motion. * It is not necessary for the pupO to learn the names of these partsof the mouth limbs, but the teacher should thoroughly know are explained in the authors Briefer Zoology (Henry Holt &Co.). 6 82 FIB8T LESSONS IN ZOOLOGY. These gill-paddles come oflE with the gills, and are much as inFig. 85. So much for the legs and their gills. Now we will remove the leg likelimbs in front; they can be easily detached with the point of a knife,and when removed laid upon the table in the order of Figs. 87-83 ;and Anally the jaws
First lesson in zoology : adapted for use in schools . water in motion. * It is not necessary for the pupO to learn the names of these partsof the mouth limbs, but the teacher should thoroughly know are explained in the authors Briefer Zoology (Henry Holt &Co.). 6 82 FIB8T LESSONS IN ZOOLOGY. These gill-paddles come oflE with the gills, and are much as inFig. 85. So much for the legs and their gills. Now we will remove the leg likelimbs in front; they can be easily detached with the point of a knife,and when removed laid upon the table in the order of Figs. 87-83 ;and Anally the jaws (Fig. 82) can be removed. We will then examinethe mouth parts, beginning with the jaws (Fig. 83). These are , as they are held flrmly in place by a strong muscle whichspreads out on the top of the shield. They are very stout and broadat the end. Unlike our own jaws, they work from side to side, not upand down. They are like a pair of millstones, and crush bones andshells. To the upper side is attached a three-jointed feeler, called. casp FiQ. 87.—Third masdllipede. and, inner, and ex, outer, division, with the gill, andjJaft, the giU-paddle. palpus ; it is fringed with delicate hairs, which may possibly havethe sense of taste. Next to the jaws, and hugging them closely, are two small white deep-ly lobed appendages. These are the accessory jaws, called maxillae(Fig. 83, 84). They act like our tongue to arrange the food and keep itin place to be crushed by the jaws. They have attached to the base agill-paddle {flab) which in the second pair is very large and fan-shaped. Between the second pair of accessory jaws and the great claws arethree pairs of curious appendages, half jaws and half legs ; they arethe foot-jaws, and are hence called maxillipedes. (Fig. 85-87).Like the legs they bear gills, while the gill-paddles, especially in thefirst and last pair, are very large. The first pair is divided into threedivisions, besides the gill and its paddle, while the two s
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
