Chapter XVIII: POLYZOA—continued

FRESH-WATER POLYZOA—PHYLACTOLAEMATA—OCCURRENCE—STRUCTURE OF
_CRISTATELLA_—DIVISION OF COLONY—MOVEMENTS OF COLONY—RETRACTION AND
PROTRUSION OF POLYPIDES IN POLYZOA—STATOBLASTS—TABLE FOR
DETERMINATION OF GENERA OF FRESH-WATER POLYZOA—REPRODUCTIVE PROCESSES
OF POLYZOA—DEVELOPMENT—AFFINITIES—METAMORPHOSIS—BUDDING 492