NEBELA. 93 



Genus 25. NEBELA Leidy, 1874. 



Difflugia (pars) EHRENBERG in Monatsb. Akad. Wiss. Berlin, 



1848, p. 218. 

 Nebela LEIDY in Pr. Acad. Philad. 1874, p. 156. 



Test of thin chitinous material, usually very trans- 

 parent, more or less compressed, ovate, pyriform, or 

 elongate, in broad view, with a surfacing of circular 

 or oval discs or plates, uniform or of mixed sizes, or 

 of amorphous scales, with straight rods or rectangular 

 plates interspersed without any appearance of regu- 

 larity ; plain-margined, or keeled, the carina being 

 sharp-edged. The plasma ordinarily colourless, but 

 more or less granular, the contents consisting of 

 chlorophyllous food-pellets, large and small, with 

 numerous refringent oil-globules, and one or more 

 clear vacuoles. The nucleus always single situated 

 in the upper region of the body. Bands of ecto- 

 plasm sometimes bifid or attenuated threads of 

 ectoplasm, emanating chiefly from the posterior part 

 of the body and forming attachments with the 

 internal surface of the test. Pseudopodia variable in 

 number, blunt, rarely bifid or branched. 



1. Nebela collaris (Ehrenberg) Leidy. 

 (Plate XXV, figs. 4-7 ; and figs. 85 and 86 in text.) 



Difflugia collaris EnKENBERGin Monatsb. Akad. Wiss. Berlin, 

 1848, p. 218; and in Abli. Akad. Wiss. Berlin, 1871 

 (1872), p. 143, t. ii, f. 27; PRITCHARD Hist. Infus. new 

 ed. (1852), p. 208; and ed. 4 (1861), p. 553. 



Difflugia reticulata EHRENBERG in Monatsb. Akad. Wiss. 

 Berlin, 1848, p. 218 ; Mikrogeol. (1854), p. 331 ; and in 

 Abh. Akad. Wiss. Berlin, 1871 (1872), p. 143, t. ii, f. 26. 



Difflugia cancellata EHRENBERG in Monatsb. Akad. Wiss. 

 Berlin, 1848, p. 379; Mikrogeol. (1854), p. 331; and in 

 Abh. Akad. Wiss. Berlin, 1871 (1872), p. 145, t. ii, f. 3. 



Difflugia carpio EHRENBERG Mikrogeol. (1854), p. 331 ; in 

 Abh. Akad. Wise. Berlin, 1871 (1872), p. 251, t, ii, ff. A, 

 27; B, 21. 



Difflugia laxa EHRENBERG in Abh. Akad. Wiss. Berlin, 1871 

 (1872), p. 254, t. iii, f. 22. 



