BIOLOGY FOR YOUNG BEGINNERS. 



535 



anus, at the under part of the tail-piece (telson). On each side of the 

 cephalo-thorax lies a long, soft, yellowish-green mass. This is the 

 liver, and it opens into the small, pyloric end of the stomach by sev- 

 eral ducts or pipes on each side. Away up in the front part of the 

 cephalo-thorax, at the base of the feelers (antennae) on either side 



Tooth. 



T-shaped Frame. 



Tooth. 



Fig. 23. The Lobster's Mill. 



you may see a soft green mass called the "green gland" (Fig. 22). 

 This is supposed to be the kidney. Next we will take a look into the 

 side-chambers (Fig. 22) of the cephalo-thorax, and see what the three 

 pair of walking-legs, the great pincers (chelae), and the two pairs of 

 jaw-feet, are doing in there. In each chamber we find eighteen little, 



Fig. 24. The Mill and its Muscles. 



Fig. 25. Tn.E Hairy 

 Cushions at the small 



END OF THE STOMArn, 



through wmrn the 

 Food is strained. 



tapering, feathery-like bodies. Each has a central stem, surrotmded 

 by fine, feathery filaments. They look very much like so many little 

 bottle-brushes (Fig. 22). These are the gill-plumes, and this room is 

 called the gill, or branchial chamber. The gills are placed in two 



sets, six in one and twelve in the other. 



The first row is fastened to 



