XVlil SCHEME OF CLASSIFICATION 
Orders. 
TARDIGRADA 
(pp. 258, 477). 
PENTASTOMIDA 
(pp. 258, 488). 
PYCNOGONIDA = PODOSOMATA = PANTOPODA (p. 501). 
Families. 
Decolopodidae (p. 531). 
Colossendeidae = Pasithoidae (p. 532), 
Eurycididae = Ascorhynchidae (p. 533). 
Ammotheidae (p. 534). 
Rhynchothoracidae (p. 535) 
Nymphonidae (p. 536). 
Pallenidae (p. 537). 
Phoxichilidiidae (p. 538). 
Phoxichilidae (p. 539). 
Pycnogonidae (p. 539). 
