xii 



SCHEME OF CLASSIFICATION 



HIRUDINEA (p. 392) 



RHYNCHOBDELLAE (p. 405) 

 GNATHOBDELLAE (p. 407) 



Family. 



Slchthyobdellidae (p. 406). 

 Glossiphoniidae (p. 406). 

 Gnathobdellidae (p. 407). 

 Herpobdellidae (p. 407). 



SIPUNCULOIDEA (pp. 412, 420). 

 PRIAPULOIDEA (pp. 412, 430). 

 ECHIUEOIDEA (pp. 412, 434). 

 EPITHETOSOMATOIDEA (pp. 412, 444). 



GEPHYREA(p.411) 



PHOBONIS (p. 450) 



POLYZOA (p. 465) 



EHTOPBOCTA 



(pp. 475, 487) 



ECTOPROCTA 



(p. 475) 



Gymnolaemata 

 (p. 476) 



CYCLOSTOMATA 



(p. 477) 



CHEILOSTOMATA 



(p. 477) 



CTEXOSTOMATA 



(p. 477) 

 Phylactolaemata (pp. 476, 493) 



/ Articulata (p. 517). 

 \ luarticulata (p. 517). 

 fCellularina(p. 518). 

 -| Flustrina (p. 518). 

 (Escharina (p. 518). 

 / Alcyonellea (p. 518). 

 \ Vesiculariua (p. 518). 



