III. PORIFERA or SPONGIDA 
ARRANGED BY 
R. W. HAROLD ROW. 
CONTENTS 
I. Titles 
II. Subject Index : — 
General works, economics, and technique 
Anatomy 
Physiology . . 
Development 
Distribution : — 
Actual 
Fossil 
III. Systematic : — 
Pori f era, general 
Calcarea 
Homocoela 
Heterocoela 
Hexactinellida 
Lyssacina 
Dictyonina 
Demospongiae 
Myxospongida 
Tetractinellida 
Choristida 
Lithistida 
Monaxonida 
lladromerina . . . . . . 
Halichondriya 
Keratosa 
Incertae sedis 
PAGE 
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( n -9242 h) 
