NEBELA LAGENIFOEMIS. 108 



Lacustre, I, 3 (1906), pp. 354, 355; Moreay in Ann. 



Scott. Nat. Hist. 1907, p. 95. 

 Nebela ambigiia Cash in Tr. Mancli. Micr. Soc. 1891 (1892), 



p. 50, t. ii, f. 17. 

 Nebela collaris vai'. lageniformis (i. S. West in Jrn. Linn. 



Soc, Zool. XXVIII (1901), p. 321. 



Body of the test elliptic in broad view, compressed, 

 witli a prominent tubular neck wliicli is swollen mid- 

 way between its junction with the body and the oral 

 extremity ; the mouth convex or p^rcuate. In lateral 

 view also elliptic, but one half narrower ; the neck 

 compressed, slightly convex on the lateral margins. 

 Structure of the test very similar to that of the allied 

 species, being of clear transparent substance and 

 covered with circular discs, which adhere at their 

 edges but do not overlap ; sometimes polygonal scales 

 form t"he surfacing, with a small proportion of longi- 

 tudinal rods or plates intermingled. Plasma and 

 pseudopodia not differing from those of other members 

 of the genus ; the nucleus normally situated, one or 

 more contractile vacuoles frequently visible. 



Dimensions : Length 120-125 fx; breadth of body 

 65-70 ju, ; of mouth about 20 jjl. 



In boggy ground, amongst Sphaijnuiii, Dunham and 

 Knutsford, Cheshire ; more abundant in sub-alpine 

 districts in Wales and Scotland as at Capel Curig and 

 Llyn Idwal, in Carnarvonshire, and Towyn, Merioneth- 

 shire. Near Siitton Broad, Norfolk {E. Gurney). 

 Bpping Forest, Essex {D. J. Sconrfield). Penyghent, 

 W. Yorks {G. S. West). Moel Siabod, N. Wales, at 

 2500 ft. (/. Hoplcinson). Loch Ness, Scotland (D. J. 

 Scour field). 



This species is very distinct; its neck, with the swollen 

 margins, sufficiently differentiating it from other Nehelx. 

 It occurs very frequently in Sphagnum from the Welsh 

 localities above named. But little variation can be 

 noted in size or structure. Leidy was of opinion that 

 this was an intermediate form connecting N. collaris 

 with N. barbata, but we have sought in vain for any 



