III. PORIFERA or SPONGIDA 
ARRANGED BY 
R. W. HAROLD ROW. 
CONTENTS 
PAGE 
I. Titles . . . . .. .. 2 
II. Subject Index: — 
General works, economics, and technique . . . . 4 
Anatomy . . .. .. .. .. .. .. 4 
Physiology . . . . . . . . . . . . . . 4 
Development aud growth . . . . . . . . . . 4 
Ethology . . . . . . . : . . . . . . 4 
Distribution : — 
Actual . . . * . . . . . . . . . . 4 
Fossil . . . . . . , . .... . . 4 
III Systematic : — 
Porifera, general . . . . . . . . . . . . o 
Oalcarea . . . . . . . . . . . . , . 5 
Non-CalcarOa 
Myxospongida 
Hexactinellida 
Tetraxonida 
Homosclerophora (vacant). 
Astrotetraxonida . . . . „ . . . . 7 
Sigma tote traxonida . . . . . . . . . . 7 
Lithistida . . . . . , . . . . . . 8 
Euceratosa (vacant). 
Incertae sedis . . . . . . . . . . . 8 
(n-8913 h) a 5 
CS Cn Ox 
