CRAWFISH AND LOBSTER. 135 



of the carapace on tlie left side removed to show the gills as 

 they appear in the gill-space. The big claw and the four 

 smaller claws or legs are cut off, so that the other parts can 

 be plainly shown. 



121. If the pupils are skillful enough, it will be a good 

 exercise for them to separate the various appendages of the 

 crawfish, and arrange them upon a card, just as the beetle 

 was arranged, as shown on page 66, fastening the carapace 

 in the middle of the card with the back uppermost, then 

 gluing the abdomen to the card, or, if possible, separating 

 each ring of the abdomen and gluing each one separately to 

 the card, one behind the other, and then arranging the ap- 

 ,pendages on each side of the thorax and abdomen, and with 

 a pen marking the names of the various parts on the card. 



Figure 126 represents the way in which the mouth-parts 

 of a crawfish or lobster may be arranged. 



As the lobster is a much larger animal than the craw- 

 fish, it will be easier to separate its appendages, and these 

 may as well be taken from a specimen which has already 

 been boiled, or as it may be obtained in the market. They 

 may then be dried and fastened to a card with glue. The 

 red color of the lobster appears only when the animal is 

 boiled. When alive the color of the creature is a reddish- 

 yellow mottled with bluish or greenish-black. 



125. The eggs are carried by the crawfish and lobster 

 glued in masses to the swimming appendages which are 

 attached to the lower surface of the abdomen, and the 

 creatures retain them in this way till the young hatch out. 



