CLASSIFICATION OF WORMS. 



373 



Tubicola (Serpula, etc.) ; Terricola (Earth-worms) ; and Suc- 

 toria (Leeches). 



II. HELMINTHA OR ENTOZOA OR SCOLECIDA, including, to- 

 gether with Turbellaria,- worms which have their abode 

 during a portion, or all of their lives, in the bodies of other 

 animals ; as Trematoda (Flukes) ; Cestoidea (Tape-worms) ; 

 Acanthocephala (Spine-headed worms) ; Nematoidea (Thread- 

 worms), etc. 



These Sub-classes,* and the divisions of them, which may 

 be provisionally treated as Orders, are here presented in 



* Huxley (Introduction to (fie Classification of Animals) classifies the 

 Vermiform articulates essentially in this way : 



f 



Annelida. 



Chtetophora. 



f Errantia. 

 Tubicola. 

 Terricola. 

 Gephyrca. 



[ Discophora. - ( Suctoria. 



[ Trematoda. 

 Tseiriada. 



Turbellaria. 

 Scolecida. ', . 



Acanthocephala. 



Nematoidea, 



I. Kotiferu. 



Rollestone (Forms of Animal Life) regards the Vermes as a Sub-kingdom, 

 and divides the group essentially thus : 



Annulata. - 



f 



fPoly- 



chaeta. 



,,, , . Sub-class Chietophora. -{ 



Class 1. Annulata proper. -{ Oligo- 



chseta. 



l. Class 3. Gephyrea. 



I Sub-class Discophora. 



Aunuloicla. 



Order Chaetognatha (Sagitta). 



Class 3. Nematelminthes. " Nematoidea. 



Acanthocephala. 



Class 4. Rotifera, 



Class 5. Platyclminthcs. 



f Order Turbellaria. 

 " Trematodes. 

 l. " Cestodes. 



