XEDELA TBIAXGULATA. 127 



animal is seen, as through a glass case, freely suspended 

 in the interior, and its surface is covered with markings 

 of almost mathematical regularity." He proceeds : " I 

 at first considered that this carapace was constructed of 

 very minute pieces of pure diaphanous silica cemented 

 together ; but as, on drying it and subjecting it to the 

 flame of a spirit-lamp, it becomes more or less dis- 

 torted, and the markings are almost obliterated, I have 

 come to the conclusion that it is more likely of a 

 membranous nature." 



Neither locality nor habitat is given, but as the 

 article is signed " Fred. H. Lang, Reading," it may 

 be assumed that the rhizopod was found by him in the 

 neighbourhood of that town. It occurred in tolerable 

 abundance.] 



[Var. bicornis (G. S. West). (Fig. 101.) 



Nebela bicornis G. S. WEST in Ann. Scott. Nat. Hist. 1905, 

 p. 91, ff. A-E (p. 93). 



Test similar in size and shape to that of the type, 

 the posterior processes or " horns " more pronounced, 

 being longer and narrower; aperture rather wider 

 and minutely in place of broadly undulate ; the minute 

 plates composing the test more oblong, their axes 

 (with the animal in its normal position) vertical. 

 " Basal view of shell elliptical with produced ex- 

 tremities, mouth subcircular or rotund elliptic." 



Dimensions: Length of test 96-1 17 p; extreme 

 breadth 86-101 //,; width of aperture 23-25 JJL. 



Plankton of Loch Shiel, Inverness, Scotland (G. 8. 



West). 



This form differs so little from Nebela triangulate^ 

 so far as can be judged from the meagre description 

 given of that species by its author arid the absence of 

 a sketch of the oral view, that it can only be con- 

 sidered as a variety. The pseudopodia were not seen, 

 all the individuals examined beinsf "more or less en- 



