8 



MARraE ANIMALS OF MASSACHUSETTS BAY. 



of expansion and contraction. Fig. 2 represents it with all its 

 external appendages folded in, and the whole body flattened ; in. 

 Fig. 3, the tentacles begin to steal out, and the body rises slightly ; 

 in Fig. 4, the body has nearly gained its full height, and the ten- 

 rig. 2. Kg. 3. Fig. 4. 



tacles, though by no means fullj^ spread, yet form a delicate 

 wreath around the mouth ; while in Fig. 5, drawn in life size, the 



Fig. 5. 



Figs. 2, 3, 4. Actiula Id dlffereot degrees of expansion. {Atjaastz.) 



Fig. 5. 'Ihe same Acllnla (Metridium marginatum) fuUy expanded ; natural size. 



