AXIMALS OF UXCERTAIX RELATIOXSHIPS 60 



surrounding medium and assume feathery shapes (Fig. 43), 

 which often bear so close a resemblance to certain plants 



FIG. 43.-Lamp-shells 



eft 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. 



