Brown : FrcsJiivater Rhisopods. 107 



Difflugia acuminata Ehrenb. Common in sediment. Test 

 often consists entirely of diatom frustules (=-D. bacillarhim 

 Perty. Ecclesall Woods. Froggatt, etc. 



Difflugia glohulosa Dujardin. Common. Ecclesall Woods, 

 Ringinglow, etc. 



Difflugia urceolata Carter. Not common. Sediment of 

 water-trough, Froggatt. 



Difflugia constncta (Ehrenb) Leidy- Common in pools. 



Lecquereusia spiralis (Ehrenb) Schlumb. A form with an 

 apparently coiled shell. Generally common. Stanage, Frog- 

 gatt, Ringinglow, Occasionally the test consists of angular 

 sand grains. (Ecclesall Woods). 



Nebela collaris (Ehrenb) Leidy. A common form in Sphag- 

 num. Froggatt, Ringinglow, etc. 



Nebela flabellulum Leidy. Less common, but in similar 

 situations. Froggatt. 



Quadrula symmetrica Schultz. Common in pools. Frog- 

 gatt, Stanage, etc. 



Quadrula irregtdaris Archer. Amongst mossy growth on 

 water trough. Ecclesall. 



Cochliopodium bilimbosum (Auerb) Leidy. Occurs associated 

 with the last form at Ecclesall. 



Family Euglyphina. 



Euglypha alveolata Dujardin. A common form and widely 

 distributed. Both spined and unspined forms occur ift most 

 situations. 



Euglypha ciliata (Ehrenb) Leidy. Also common in sediment 

 and amongst aquatic plants. Ringinglow, Froggatt, Stanage. 



Assulina seminulum (Ehrenb). A few empty tests amongst 

 Sphagnum. Ringinglow and Burbage. 



Cyphoderia ampulla (Ehrenb) Leidy. Common and widely 

 distributed in sediment and amongst vegetation in pools. 

 Ringinglow, Burbage, Ecclesall Woods, etc. 



Sphenoderia lenta Schlumb. A few empty tests amongst 

 Sphagnum. Stanage. 



Trinema enchelys (Ehrenb) Leidy. One of the most widely 

 dispersed forms, very variable in size. 



Pamphagus mutabilis Bailey. Many associated together 

 jimongst floating Alga. Burbage. A form with very delicate 

 flexible test. 



1909 March i. 



