BRITISH 
FRESHWATER RHIZOPODA. 
During the publication of the earlier volumes 
of this monograph records of several genera and 
numerous species and varieties of Freshwater Rhizo- 
poda have been added to the British Fauna. 
When the third volume was issued fifty genera had 
been described, now by the addition of Pyxidicula, Cap- 
sellina, Diplochlamys, Microcorycia, Bullinula, Cucur- 
bitella, Averintzia, Parmulina, and Plagivphrys, and 
the omission of Owrameba, the number is increased to 
fifty-eight. In this volume descriptions are given of 
the genera, species, and varieties thus added to our 
list. They include six newly-described species : 
Capsellina timida. Hyalosphenia ovalis. 
Microcorycia radiata. Nebela tubulata. 
OCryptodifiiugia eboracensis. N. scotica. 
In the following enumeration of the genera the 
original arrangement and numbering is retained for 
the sake of easy reference. Quadrulella is substituted 
for the pre-occupied name Quadrula (26) and Ourameba 
(6) is omitted as it has been found to be an Ameba 
with parasitic alge as explained in Vol. IT (p. viii). 
Order I. AMCBINA. 
Family 1.  Lososa. 
(1) Ameba, (2) Dactylospherium, (8) Mastigameba, 
(4) Pelomyzxa, (5) Lithameba. 
VOL. Iv. 1 
