III. PORIFERA or SPONGIDA 
ARRANGED BY 
I. B. J. SOLLAS 
CONTENTS 
PAGE 
I. Titles . . 
.. 2 
II. Subject Index: — 
General works, economics, and technique 
. . 
.. 4 
Anatomy 
4 ' 
Physiology 
. . 
. . 
4 
Development 
.. 4 
Ethology 
Evolution, Inheritance, Variation . . 
.. 5 
Distribution : — 
Actual 
Fossil 
•• 
5 
III. Systematic : — 
Porifera, general 
6 
Calcarea 
. . 6 
Homocoela (vacant) 
Heterocoela .... 
.. 6 
Myxospongiae 
6 
Hexactinellida . . . . ... 
6 
Lyssacina . . 
6 
Dictyonina 
... • 7, 
Demospongiae 
7 
Tetractinellida ... . . . . 
7 
Choristida 
7 
Lithistida 
.. . 7 
Monaxonida . , 
9 
Hadromerina 
9 
Halichondriua 
.. 9 
Keratosa (vacant) 
Incertae sedis 
(n- 8818 h) 
b 1 
