126 



BRITISH FRESHWATER RHIZOPODA. 



minute angular plates of fairly regular size ; in front 

 view forming an irregular triangle, the anterior apex 

 truncated for the aperture which has a slightly curved 

 margin, the posterior apices produced into short blunt 

 processes diverging laterally, margin of test between 

 these apices convex ; in side view very narrow, appear- 

 ing like " a cocked hat turned edgeways.* Plasma 

 when the pseudopodia are extruded occupying about 

 a third of the interior of the test ; pseudopodia few, 

 rather long, simple or slightly branched, linear, ex- 

 tremities obtuse. 



FIG. 100. Broad views of two examples of Nebela triangulata. After 

 Lang, loc. cit. (slightly reduced), x ? (The magnification given 

 by the author appears to be incorrect.) 



Dimensions : " Much smaller " than either " Difflugia 

 proteiformis " or Lesquereusia spiralis (with which it 

 was associated). 



(?) Neighbourhood of Reading, Berkshire (F. A. 

 Lang). Carrig Mountain and Connemara, Ireland (W. 

 Archer). 



Lang, in his description of this species, says that 

 the carapace " is so remarkably transparent that the 



* The Conchulina when active usually have the fundus above and the aper- 

 ture below, but they are more frequently represented in the reverse position, 

 to which this remark applies. 



