264 JELLV-FISH, STAR-FISH, AND SEA-URCHINS. 



socket joint, and provided with muscles at its base. 

 On the external surface, besides the spines, we 



Pfg. 38.— A Lily-star. (From CasseU's "Nat. Hist.") 



meet with pedicellari?e (Fig. 33 magnified), and also 

 with the madreporic tubercle (Fig. 39, m). The 

 pedicellariaj in their niain features resemble those 



