ANIMALS OF UNCERTAIN RELATIONSHIPS 69 
surrounding medium and assume feathery shapes (Fig. 43), 
which often bear so close a resemblance to certain plants 
Fic. 43,—Lamp-shells or Brachiopods (on left of figure), fossil and living, and (on 
right) plant-like colonies of sea-mats. 
that they are frequently preserved as such. What their 
exact position is in the animal scale it is somewhat difficult 
to say; but judging especially from their development, it 
appears probable that they are distant relatives of the seg- 
mented worms. 
