38 BRITISH FEESHWATEE EHIZOPODA. 



14. Difflugia brevicolla *p. nov. 

 (Plate XIX, figs. 12 and 13 ; and fig. 55 in text.) 



Test spherical, with a short neck, the extremity of 

 which is truncated to form the circular mouth, its 

 margin plain, without contraction or dilatation ; struc- 

 ture chitinoid, with a surfacing of irregular scales or 

 these with an admixture of small diatom-frustules, and 

 occasionally a few sand-grains ; sometimes with a single 

 quartz particle of larger size adhering to the crown. 

 Characters of the plasma, pseudopodia, and nucleus 

 unknown. 



FIG. 55. Difflugia brevicolla. Empty test from Dunham Marsh, x 280. 



Dimensions : Diameter 70-90 //, ; of mouth 35-40 p. 



In deep ditches of peat-bogs and open ponds amongst 

 decaying vegetation. Risley Moss, Lancashire, 1903 ; 

 Chilford and Dunham, Cheshire. 



In peat-bogs the test of this species is found to take 

 on the brownish colour of the water, its opacity increas- 

 ing with age. In ponds, on the contrary, it does not 

 differ in colour from other L)ifflugid& of similar structure. 

 No example was found in the active state, but amongst 

 the numerous examples from the first-named locality 

 two were observed in conjugation. 



15. Difflugia orbicularis sp. nov. 

 (Plate XX, figs. 6 and 7.) 



Test minute, spherical, with a short neck, chitinoid, 

 yellowish, or lightish brown, destitute of incrustation ; 



