THE METAMORPHOSIS OF A CRAB. 



209 



g. Notice the transparent, pulsating heart, at the base 

 of the dorsal spine, and the intestine, running from under- 

 neath the carapace out to the tip of the abdomen, to open 

 at the anus, between the forks of the telson. Notice that 

 the intestine dilates a little near the anus, to form an en- 



FlG. 106. 



FIG. 106. Anterior view of the same zoea. (Drawn by W. K. 

 Brooks from a sketch by E. B. Wilson. ) 



The reference letters are the same as those of Fig. 105. 



larged rectum, which is attached to the integument by a 

 number of small, radiating muscular fibres, and is rhyth- 

 mically contractile like the heart. The enlarged stomach 

 and liver may be obscurely seen through the side of the 

 carapace. 



