AN INTRODUCTION T6 ZOOLOGY. 



graceful curves when the animal is alive. The animal 

 receives its name, anatifera, the goose-bearer^ frOm 

 the fact that an ancient superstition represented it as 

 the offspring, and in turn the parent, of a wild goose. 

 It would seem as if the forgotten poetic genius o£ a 

 prior age, who invented this legend, had made some 

 wild forecast of the facts of alternation of generations 

 which have been already described in other forms. 

 More common than the Long-necked Barnacle are the 



rig. 49. Fig. 60. 



, Kg. 49.— Pree-swimming Naaplius larva oi a barnacle (Balanus), magnified. 

 (From Glaus and Sedgwick.) 

 Fig. 50. — Shell of adalt barnacle (Balanus tintiniiabwlum), sessile and fixed. 



common sea- side barnacles or acorn-shells, Balanus, 

 which cover the large stones of the shore near low 

 tide mark. The shell is differently arranged; it has 

 movable valves peeping out of a thick rim composed 

 of several pieces joined together. In both, the legs 

 form a group that reaches out and closes again exactly 

 like a little hand. 



