

374 



ARTICULATA : WORMS. 



one view, together with the names of the groups of which 

 these are regarded as the equivalents : 



CH^ETOPODA 



or 



CH^TOPHORA. 



ANNELIDA. 



1. DORSIBRANCHIATA or Errantia or free") 



Sea- worms with short branchial append- 

 ages along the back or body ; as the Lob- 

 worms, etc. 



2. TuBICOLA or Sea-worms which live in 



tubes ; as the Serpulas, etc. 



3. TERRICOLA or Oligochjetae or worms 



destitute of branchial appendages ; as 

 Earth-worms. j 



4. GEPHYREA or Smooth-bodied cylindrical ) 



worms, formerly classed with the Ra- > SlPUKCULOIDA. 

 diates ; as Sipunculoids and Synaptids. ) 



5. StJCTORIAor Bdellodea or Leeches ; with ) n 



sucking disks at the extremities. J 



6. CH^ETOGXATHA or free-swimming oceanic worms ; as Sagitta. 



7. GYMXOCOPA, also free-swimming oceanic worms ; as Tomop- 



teris. 



HELMINTHA, 



8. TREMATODA or Flukes ; with a single 



opening leading to a branching digest- 

 ive system. 



9. CESTOIDEA or Tape-worms, etc. ; with a 



tape-like form ; anterior end provided 

 with suckers, or hooks, or foliaceous ap- 

 pendages, or with all these ; and with no 

 alimentary canal. 



10. TURBELLARIA or Tnrbellarians ; with }~ ANNULOIDA. 



bodies covered with cilia, and unpro- 

 vided with suckers. Not parasites. 

 Planaria and Xemertes are examples. 



11. ACANTHOCEPHALA or Spine-headed 



worms ; with no division into rings or 

 segments ; no alimentary canal ; and 

 with proboscis armed with spines, as 

 Echinorhynchus. J 



