III. PORIFERA or SPONGIDA 
ARRANGED RY 
I. B. J. SOLLAS 
CONTENTS 
I. Titles 
II. Subject Index : — 
General works, economics, and technique 
Anatomy 
Physiology 
Development 
Ethology 
Evolution, Inheritance, Variation . 
Distribution : — 
Actual 
Fossil 
III Systematic: — 
Pori f era, general 
Calcarea 
Homocoela 
Heterocoela . . . , • 
Myxospongiae ... 
Iiexactinellida . . , 
Lyssacina 
Dictyonina 
Demospongiae 
Tetractinellida 
Choristida 
Lithistida 
Mohaxonida 
Hadromerina 
Halichondrina , . 
Keratosa 
Incertae sedis 
( n -11091 h ) 
PAGK 
1 
4 
4 
4 
5 
5 
5 
6 
6 
6 
G 
G 
G 
7 
7 
7 
7 
7 
7 
7 
7 
7 
8 
8 
