122 BEITISPI FEESHWATEE EHIZOPODA. 



be mistaken for it ; very transparent ; ovoid in general 

 outline, compressed laterally, and surfaced with dia- 

 phanous angular scales adhering at their edges, rarely 

 overlapping ; the marginal outline often slightly irre- 

 gular from the protrusion of these scales ; mouth 

 narrow, truncated, its margin irregular in outline, 

 generally bordered by a ring of minute irregularly- 

 shaped sand-grains. The plasma as in the preceding 

 species, not filling the cavity of the test; nucleus 

 normally situated; the pseudopodia few — sometimes 

 a single granular pseudopodium only, extending in 

 length to twice the longitudinal diameter of the test. 



Dimensions: Length 95-120 /x, [Fenard, 170-200 /a). 



In Sphagnum, Dunham, Cheshire ; also near Towyn, 

 Merionethshire, frequently associated with the pre- 

 ceding species. Loch Ness, Scotland {D. J. Scourfield). 



There is little difficulty in distinguishing this species 

 from N. dentistoma Penard when the structure of the 

 test is examined. The mouth of -A^. vitrxa is never 

 crenulate; its outline might more correctly be described 

 as irregularly dentate, from the prominence of the 

 marginal sand-grains; the oral extremity of the test 

 is more narrowed than that of the preceding species ; 

 but it must be admitted that the relationship of the 

 two is very close. 



16. Nebela tenella Penard. 

 (Plate XXVIII, figs. 18 and 19.) 



Difflvgia anmdata Eheenbebg ? in Abh. Akad. Wiss. Berlin^ 



1871 (1872), p. 249, t. iii, 1, f. 19. 

 Nehela ttnella Penakd in Arch. Sci. nat. (3) XXIX (1893), 



p. 182, t. iii, ff. 8, 9; and Faune Eliiz. Leman (1902), p. 



375, ft. 1-3 (p. 376) (; cf. Aveeintzev in Trudui S.-Peterb. 



Obshch. XXXVI (1906), 2, p. 253). 



Test small ; its broadly ovoid body terminated by a 

 prominent neck, which is thickened at the extremity in 

 both the broad and narrow lateral views ; compressed ; 

 of chitinous substance and more or less transparent. 



