No. 19.] 



ECHINODERMS OF CONNECTICUT. 



los 



Kkewise 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 pentapora. 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.) 



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

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



