60 ESSENTIALS OF ZOOLOGY 



satisfactorily. 1 In the following arrangement the Kotifera are 



acoelomate, the rest are coelomate : 



Phylum TROCHOZOA 



Sub-Phylum KOTIFERA . . Wheel animalcules 

 MOLLUSCA . . Shell fish 

 NEMATOMORPHA . Horse-hair worm 

 PODECTATHENTA . Sea mats, lamp shells, 



etc. 



NEMATODA . . Threadworms 

 ARTICULATA . Insects, Crustacea, etc. 



1 1909. Rauther, MorphoL und Verwandtschaftebez. der Nematoden ; Ergeb. 

 u. Fortschr. d. Zool, Bd. I. 



