THE CCELENTERATA 53 



within the body, for the internal surface is the 

 starting-point for the formation of the organs 

 and tissues." 



CHAPTER V 



THE CCELENTERATA 



NEXT after the animals that consist of one 

 cell only we have to consider the group of ani- 

 mals among which the lower kinds, at any rate, 

 consist of a number of cells arranged in two 

 layers. The representative of this group that 

 the reader is most likely to meet with is the Sea- 

 Anemone, the Coral animal probably he will be 

 content to know from pictures. 



Everybody who has been accustomed to take 

 a little interest in natural history, remembers the 

 use of the old-fashioned term " Zoophyte." It 

 was a name given to animals like those named 

 above, which have a flower-like appearance, due 

 to the possession of a set of petal-like arms or 

 tentacles, placed all round the mouth ; its literal 

 meaning was animal plant, in allusion to the 

 flower-like form. The great French zoologist, 

 Cuvier, gave the group name Radiata to animals 

 of this kind. This name is now not much used, 

 because we have learnt to emphasize other peculi- 

 arities possessed by these animals, as well as that 

 of radial symmetry, viz., their two-layered body- 

 wall and simple digestive space (see p. 36). The 

 group called Radiata by Cuvier, included, too, a 

 number of animals which are widely separated 

 from the " Zoophytes " in modern systems of 

 classification. 



