82 FIRST LESSONS IN ZOOLOGY. 



These gill-paddles come off with the gills, and are much as in 

 Fig. 85. 



So much for the legs and their gills. Now we will remove the leg like 

 limbs 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 finally the jaws (Fig. 82) can be removed. We will then examine 

 the mouth parts, beginning with the jaws (Fig. 82). These are hard to 

 remove, as they ai'e held firmly in place by a strong muscle which 

 spreads out on the top of the shield. They are very stout and broad 

 at the end. Unlike our own jaws, they work from side to side, not up 

 and down. They arc like a pair of millstones, and crush bones and 

 ehells. To the upper side is attached a three-jointed feeler, called 



cocp 



FIG. 87. Third maxillipede. end, inner, and ex, outer, division, with the gill, andflab, 



the gill-paddle. 



"palpus ;" it is fringed with delicate hairs, which may possibly have 

 the 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 it 

 in place to be crushed by the jaws. They have attached to the base a 

 gill-paddle (flab) which in the second pair is very large and fan-shaped. 



Between the second pair of accessory jaws and the great claws arc 

 three pairs of curious appendages, half jaws and half legs ; they are 

 the "foot-jaws," and are hence called "rnaxillipedes." (Fig. 85-87). 

 Like the legs they bear gills, while the gill-paddles, especially in the 

 first and last pair, are very large. The first pair is divided into three 

 divisions, besides the gill and its paddle, while the two succeeding 



