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. 



Fie. 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 incori-eot.) 



Dimensions : " Much smaller " than either " Difflvgia 

 ■proteiformis " or Lesquereusia spiralis (with which it 

 was associated). 



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

 Lang). Carrig Mountain and Oonnemara, Ireland {W. 

 Archer). 



Lang, in his description of this species, says that 

 the carapace "is so remarkably transparent that the 



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

 ture below, but they are more frequently represented in the I'everse position, 

 to which this remark applies. 



