BRITISH 

 FRESHWATER RHIZOPODA. 



IN the first volume of this monograph forty-four 

 genera of Freshwater Rhizopoda were enumerated as 

 represented in the British Isles, and in the second 

 volume, owing to the discovery in Britain of species 

 referable to Cryptodiffiugia, AmphizoneUa, and Zono- 

 myxa, the number was increased to forty-seven. It is 

 now, by the addition to the British list of Paulinella 

 and Clypeolina, and the representation of Gromia by 

 Allogromia and Rhynchogromia, increased to fifty, 

 whilst Lecythium is substituted for the pre-occupied 

 name Pamphagus. 



The arrangement of the genera is as follows : 



Order II. CONCHULINA (continued). 



Family 2. EUGLYPHINA. 



Genera : (32) Euglypha, (33) Placocista, (34) Assu- 

 lina, (35) Sphenoderia, (36) Paulinella, (37) Cyphoderia, 

 (38) Campascus, (39) Trinema, (40) Gori/thion. 



Family 3. G-BOMIINA. 



Genera : (41) Lecytkium, (42) Pseudodifflugia, (43) 

 Diaphoropodon, (44) Clypeolina, (45) Microgromia, (46) 

 LieberJcuehnia, (47) Allogromia, (48) Rhynchogromia. 



Family 4. AMPHISTOMINA. 



Genera : ^(49) Diplophrys, (50) Amphitrema. 

 VOL. in. 1 



