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8. An Account of the Sponges of the Lake of Tiberias, 
with Observations on Certain Genera of 
Spongillidae. 
By N. AnnanpaLe, D.Sc., F.A.8.B. 
(With Plates II to V.) 
TABLE OF CONTENTS. 
Introductory Note 
eer ects: Systematic ACCOUNT OF THE COLLEC- 
Key te the Sponges of the Lake of Tiberias. . 
Subfamily Spongillinae 
Subfamily Potamolepidinae, n 
Key to the genera of Patginelepidiriss and § some other 
freshwater genera i to be confused with them . 
Dermal pore-cells i in the Spongillidae 
Section 2.—BioLoGy AND DISTRIBUTION OF THE Spon- 
GES OF THE LaKE OF TIRERIA 
Conditions under which the different species are found.. 
Hardness of most of the species: its apparent object 
Production or non-production of gemmules . 
Central cavity of Cortispongilla and Pachydictyum 
Function of the skeletal! cortex in ee lla 
Geographical distribution 
Section 3.—-CLASSIFICATION OF THE POTAMOLEPIDINAE 
AND OF SOME OBSCURE GENERA OF SPONGILLINAE. 
Relationship of Veluspa, Miclucho- onion ta to the ent 
lidae 
Virsdapemples Annandale 
Uruguaya, Car 
Potamolepis, } Marshall ° 
Pachydictyum, Weltner 
pearl of the genera puede’ and Nudospongil 
of the family ee 
suis a 
BIBLIOGRAPHY i 
DESCRIPTION OF pare 
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