118 BRITISH FRESHWATER RH1ZOPODA. 



neck slightly constricted immediately above the mouth ; 

 in dorsal (transverse) view the appearance of the test 

 that of a perfect ellipse, the small mouth corresponding 

 with it in figure. The test structurally of chitinous 

 membrane, and colourless, with a surfacing of oval 

 plates, uniform in size, and generally without any 

 other ornamentation. Plasma not differing from that 

 of N. collaris ; the nucleus normally situated ; the 

 pseudopodia few in number and scarcely so thick as 

 those of N. tincta. 



Dimensions: Length 80-90 /A; breadth 90-110 /x. 



Chelford and Delamere, Cheshire ; Llyn Idwal and 

 near Criccieth, N. Wales. Moel Siabod and above 

 Dolgam, Capel Curig, N. Wales ; Killough and Calary 

 Bog, Co. Wicklow, Ireland (J. Hopkmson). Loch Ness, 

 Scotland (J. Murray). Bavelaw Bog, Midlothian, 

 Scotland (W. Evans). 



Nebela fldbdlulum is much less frequently met with 

 than most of its allies. Its peculiarly inflated sides 

 sufficiently distinguish it. It is to be looked for in 

 wet Sphagnwn, and seems to affect sub-alpine districts 

 more than lowland bogs. 



13. Nebella acolla sp. nov. 

 (Plate XXVIII, figs. 7 and 8.) 



Test broadly elliptic, broader than long, without 

 neck, the mouth, ventrally situated, being invisible, its 

 presence (when the test is lying on its side) indicated 

 by a slight thickening of the lower margin. The 

 test in face view narrowly ovate, the orifice, presented 

 directly to the eye, appearing as an oval slit in the 

 chitinous membrane ; structure thin and transparent, 

 and with a surfacing of minute circular or polygonal 

 plates, scarcely touching at the edges. The plasma 

 and its contents unknown. 



Dimensions : Narrowest diameter (from mouth to 

 crown of test) 60 /x; breadth (or longest diameter) 

 70 /A; breadth in narrow lateral view 35 /x. 



