. Beginners' Zoology . Appendages for Taking Food. —If possible to watch a living cray-fish eating, notice whether it places the food directly into the mouth with the large claws. Bend the large claws under and see if they will reach the just in front of the legs the crayfish has three pairs of finger-like appendages, called foot jaws(maxilli- peds), with which it passes the food from the large pincers Fig. 85. — I,mandi-ble ; 2,3, maxillae;4,5,6, maxillipeds. Fig. so. C KAiiisii(ventral surface). 56 BEGINNERS ZOOLOGY. to its mouth (Figs. 85, 86.) They are in form and in use-mor
. Beginners' Zoology . Appendages for Taking Food. —If possible to watch a living cray-fish eating, notice whether it places the food directly into the mouth with the large claws. Bend the large claws under and see if they will reach the just in front of the legs the crayfish has three pairs of finger-like appendages, called foot jaws(maxilli- peds), with which it passes the food from the large pincers Fig. 85. — I,mandi-ble ; 2,3, maxillae;4,5,6, maxillipeds. Fig. so. C KAiiisii(ventral surface). 56 BEGINNERS ZOOLOGY. to its mouth (Figs. 85, 86.) They are in form and in use-more like fingers than feet. In front of the foot jaws are two pairs of thin jaws(maxilla;) and infront of the thinjaws are a pair ofstout jaws (mandi-bles) (Fig. 8s). Dothe jaws movesidewise or upand down. Whichof the jaws has ajointed finger (palp) attached to it? Do all the appen-dages for taking food have both exopod and endopodbranches on a basal Stalk or protopod. Which of theappendages have a scalloped * How would you knowfrom looking at the crayfish that it is not merely Why are there no pincers on the hind feet ? Sense Organs. — Find the antenncc, or long feelers (, 90). Are the antennae attached above or below the Fig. 87. ?Gill cover removed and gills , gill bailer.
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