Xll 



SCHEME OF CLASSIFICATION 



RHYNCHOBDELLAE (p. 405) 

 GNATHOBDELLAE (p. 407) 



HIRUDINEA (p. 392) 



Family. 

 f Iclithyobdellidae (p. 406). 

 \ Glossiphoniidae (p. 406). 

 / Gnathobdellidae (p. 407). 

 \ Herpobdellidae (p. 407). 



GEPHYREA (p. 411) 



SIPUNCULOIDEA (pp. 412, 420). 

 PRIAPULOIDEA (pp. 412, 430). 

 ECHIUROIDEA (pp. 412, 434). 

 EPITHETOSOMATOIDEA (pp. 412, 444). 



PHORONIS (p. 450) 



POLYZOA (p. 465) 



ENTOPROCTA 



(pp. 475, 487) 



ECTOPROCTA 



(p. 475) 



( Gymnolaemata 



(p. 476) 



r Cyclostomata 



(p. 477) 



Cheilostomata 

 (p. 477) 

 ( Ctenostomata 

 1 (p. 477) 

 1 Phylactolaemata (pp. 476, 493) 



/ Articulata (p. 517). 

 \ Inarticulata (p. 517). 



{Cellularina (p. 518). 

 Flustrina (p. 518). 

 Escharina (p. 518). 

 f Alcyonellea (p. 518). 

 \ Vesicularina (p. 518). 



