Ostracoda and Foraminifera of Tidal Rivers. Z 
Amongst our dredged material from the Norfolk Broads 
similar sources or from the Gault. In dredgings from the 
river Cam, at occurred a large number of valves of 
Ostracoda totally different from any thing known to us 
and Professor Alfred Newton of Cambridge ; also for informa- 
tion kindly given us respecting the physical peculiarities of 
the district by Mr. Spencer Smyth of Gorleston and Mr. Arthur 
Saunders of King’s Lynn. To Mr. E. C. Davison of Sunder- 
] our thanks are also especially due for help afforded in 
many ways, as well as for several interesting gatherings of 
Ostracoda, which led to the researches noted in the pa paper. 
e following tables show the distribution and comparative 
frequency of the various Ostracoda in each locality, their rela- 
tive abundance being indicated by the number of asterisks 
affixed. We prefix a catalogue of the various localities, des- 
cribing briefly their physical characteristics, and noticing such 
other circumstances as seemed to be of interest in connexion 
with the fauna 
Group I. 
A. Clyde Estuary.—At Langbank the tide leaves bare a long 
