SCIENTIFIC AND POPULAE 

 GEOUPS OF 



NAMES OF 

 ' WOEMS." 



THE CHIEF 



A. 



B. 

 C. 



PLATYHELMINTHES (Flat-worms). Including :— 



1. TuEBELLAEiA (Planarians). 



2. Trematoda (Flukes). 



3. Cestoda (Tape-worms). 



NEMEETINEA (Long unsegmented worms, mostly marine). 

 NEMATODA (Thread-worms or Eound-worms). 



D. NEMATOMOEPHA or GOE- 

 DIACEA (Hair-worms). 



E. ACANTHOCEPHALA (Includ- 

 ing Echinorliynchus). 



F. CHiETOPODA (Bristle-worms). 

 Including : — 



1. Oligoch^ta (Earth- 

 worms and their allies). 



2. PoLYCH^TA (Marine 

 bristle-worms). 



G. GEPHYEEA. 



H. HIEUDINEA (Leeches). 



I. PHOEONIDEA (Phoronis). 



J. ENTEEOPNEUSTA (Balano- 

 glossus). 

 Some of the distinguishing features 

 of the groups mentioned above are 

 outlined in the following 



BEIEF SYNOPSIS OF THE 

 CHIEF GEOUPS OF WOEMS. 



Figure 3. 

 Fasciola hepatica, the Liver-fluke 

 of the Sheep and Ox. seen from 

 below and enlarged about 2 

 diameters. The ventral sucker 

 is visible at a thort distance 

 behind the mouth. In some 

 related species it is situated 

 further back. [TREMATODA.] 



A. PLATYHELMINTHES. 



Animals of flattened shape, their 

 viscera not contained in a " body- 

 cavity." The alimentary canal, which 

 is either simple or branched, has no 



anus or vent. Mostly aquatic or parasitic ; exceptionally living 



on land in moist situations. These include : — 



(1) TuRBELLARiA (sce Fig. 14). Usually with soft, oval or 



elongate, unsegmented body, covered with minute cilia, or vibratile 



" hairs." Mouth often in centre of ventral surface, or even further 



