No. 19.] 



ECHINODERMS OF CONNECTICUT. 



105 



likewise develops into a long-armed pluteus, and this by a com- 

 plicated metamorphosis gives rise to the bizarre creature shown in 

 Fig. 19, which actually represents the young urchin, although it 



FIG. 19. Mellita pcntapora. Young urchin shortly 

 after the metamorphosis from the free-swimming 

 pluteus. The pentagonal area in the center represents 

 the mouth, in the angles of which are the five teeth. 

 The spines and tube-feet are at this stage of enor- 

 mous size relative to the size of the body. (After 

 Grave.) 



differs widely in appearance from the adult. The oval body is 

 provided with a small number of spines and tube-feet of relatively 



