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ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL. 27 



Fig. 17. a, ceriantharian, removed from tube; b, sipunculid, with in- 

 trovert partly everted; c, enteropneust, showing anterior 

 ends; d, Listriolobus pelodes, seen from the sides; e, 

 Arhynchite sp., in lateral view, tongue missing. 



