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t). 



Fig. 140.— Development and metamorphosis of the starfish. A, J^°^!,al vie\v of 

 early%iliated larva, showing ciliated bands and coelomic pouches ;Bvgitral^^^^^^^ 

 of bipinnaria larva showing the extension of the left and ^ightcoelomic pouches . 

 G, dorsal view of the same larva showing the left j^^dreponc pore and water t^^^^ 

 aAd the fusion of the left and right coelomic Pouches to fo^^l^fi^^i'/.^f'^^bes f?Sm 

 D, dorsal view of an older larva showing the budding of the ^ve water tubes trom 

 the left coelom; E, view of left side of a stijl older larva showing the water a^^^^ 

 lar system developing from water tubes, and the rays of the adult starfish develop 

 ing on the dorsal side; P, Brachiolaria. larva . in the Profess of metamorphosis 

 The larva has settled on the preoral region which is g^^eatly shortened G.aboral 

 view of a young starfish showing the developmg sP^^es; a anus ac, anterior 

 coelom; ad, anterodorsal arm; b, brachiolar arms ; cj, amoral ciliated band cij-, 

 dorsal surface developing rays ; es, esophagus ; /, point of fixation tnf, i^^stine . 

 I, lateral arm; Ic, left coelomic pouch; m mouth ; md, median doisa arm n^^^^^ 

 madreporic pore and water tube; vd, posterodorsal arm; ^'o- Po^toral ^liated band 

 pr, preoral ciliated band ; re, right coelomic pouch ■ sp, sPines;sf stomach to, five 

 water tubes of water vascular system. (Modified from Wilson and McBride. Ke 

 produced by permission of The Macmillan Company.) 



