III. PORIFERA or SPONGIDA 
ARRANGED BY 
I. B. J. SOLLAS 
CONTENTS 
I. Titles . . . . . . a . * 
PAGE 
.i 2 
II. Subject Index: — 
General works, economics, and technique 
.> 4 
Anatomy 
4 
Physiology . . 
4 
Development 
4 
Ethology 
.. 4 
Variation 
4 
Distribution : — 
Actual 
.. 4 
Fossil 
5 
III. Systematic : — 
Porifera, general 
.. 5 
Calcarea 
5 
Ilomocoela 
5 
Heterocoela 
5 
Hexactinellida 
5 
Lyssacina 
5 
Dictyonina 
5 
Demospongiae 
7 
Tetractinellida 
7 
Choristida 
, . 7 
Lithistida 
>. 7 
Monaxonida . . 
. i i 
Hadromerina 
.. 7 
Halichondrina , . 
8 
Keratosa . . . . . . * . . * 
.. 10 
Incertae sedis 
i. 10 
(n-9210 h) 
c 1 
