NEBELA TUBULOSA. ]11 



These plates are distinctly seen under a power of 

 about 400-500 diameters. 



The occurrence of N. tubidosa seems to be sporadic. 

 It is not often met with, but where it occurs it is 

 usually plentiful. Such was the case in the Sychnant 

 Pass, and at Llyn Idwal. It occurred in the spring 

 of 1904 in great abundance in Sphagnum gathered at 

 Dunham during the preceding summer, and kept 

 through the winter in a garden frame. 



8. Nebela equicalceus Leidy.* 



(Fig. 94.) 



Diffltogia (Nebela) equicalceus Leidy in Pr. Acad. Philad. 



1874, p. 156. 

 Nehela equicalceus Leidy in Pr. Acad. Philad. 1876, p. 118, 



ff. 12, 13. 

 Nehela hippocrepis Leidy (pars) Freshw. Rliiz. N. Amer. 



(1879), p. 156, t. XXV, ff. 9-14; Hitchcock Synops. Freshw. 



Rhiz. (1881), p. 22 ; Taeanek in Sitzber. bohm. Ges. Wiss. 



1881 (1882), p. 231 ; and in Abh. bohm. Ges. Wiss. (6) 



XI (1882), 8, p. 41 ; (c/. Blochmann Mikr. Thierw. Siiss- 



wass. ed. 2 (1895), p. 17;) Eypeeth Naturgesch. mikr. 



Siisswass. ed. 8 (1900), p. 265; G. S.West in Jrn. Linn. 



Soc, Zool. XXVIII (1901), p. 328 ; Penaed Faune Rhiz. 



Leman (1902), p. 575, f. 6 (p. 572) ; Averintzev in 



Trudui S.-Peterb. Obshch. XXXVI (1906), p. 2-37 ; 



Schouteden in Ann. Biol. Lacustre, I, 3 (1906), pp. 353, 



355. 



Test in broad view pyriform, with a thick, bhmt, 

 solid carina extending round the convex crown, down 

 the lateral borders, and ending in digitate processes 

 which project downwards into the cavity ; the mouth 

 transversely oval, its outline convex. Body of the 

 test with a surfacing of transparent circular discs ; its 

 margins pale straw-coloured, and homogeneous. The 

 protoplasm, in colour and other respects as in N. collaris 

 and its allies ; nucleus normal ; pseudopodia as in X. 

 carinata. 



* [Nehela hippocrepis Leidy : Cash, MS.] 



