NEBELA TRIANGULATA. 127 



animal is seen, as tlirougli 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 

 membranoiis 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 Gr. S. West in Ann. Scott. Nat. Hist. 190-5, 

 p. 91, ff. A-B (p. 9-3). 



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 96-117 ju,; extreme 

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



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



West). 



This form differs so little from Nebela triangulata, 

 so far as can be judged from the meagre description 

 given of that species by its author and 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 being " more or less en- 



