104 BRITISH TEESHWATER EHIZOPODA. 



approach to either of those species. The former has 

 not, in any of its variations, the tubular swollen neck 

 of N. lageaifovmis ; whilst N. harbata is very much 

 smaller, and has a neck, with parallel margins, con- 

 siderably narrower in proportion to its length. The 

 species though stated by Penard to be rare on the 

 continent is frequently met with in sub-alpine localities 

 in this country. 



4. Xebela militaris Penard. 

 (Plate XXV, figs. 15 and 16.) 



Hyalosphenia tincta Leidy (pars) Freshw. Rhiz. N. Amer. 



(1879), p. 138, t. XX, f. 18 ; Landacre in Pr. Ohio Acad. 



Sci. IV, 10 (1908), p. 428. 

 Nehela collans Leidy (pars) Freshw. Ehiz. N. Amer. (1879), 



p. 147, xxiii, f. 7 ; G. S. West (pars) in Jrn. Linn. Soc, 



Zool. XXVIII (1901), p. 321. 

 Nebela htirsella Vejdovsky (pars) Tliier. Org. Briinn. Prag. 



(1882) t. ii, f. 2; Taeanbk (pars) in Sitzber. bohm. Ges. 



Wiss. 1881 (1882), p. 230, f. 2; and in Abh. bohm. Ges. 



Wiss. (6) XI (1882), 8, p. 36, t. iii, ff. 7-14. 

 Nebela militaris Penaed in Mem. Soc. Geneve, XXXI (1890), 



2, p. 164, t. vii,ff. 16-22; and Paune Rliiz. Leman (1902), 



p. 368, ff. 1-4 (p. 369) ; Aveeintzev iu Trudui S.-Peterb. 



Obshch. XXXVI (1906), 2, p. 248; and in Zool. Anzeig. 



XXXI (1907), p. 3] ; ScHOUTEDEN in Ann. Biol. Lacustre, 



I, 3 (1906), pp. 354, 356 ; Mueeay in Ann. Scott. Nat. 



Hist. 1907, p. 95. 



Test small, ovoid in broad view, very transparent, 

 the crown semi-circular; the sides tapering into a 

 narrow neck; at the convex mouth slightly dilated, 

 the lips having a thickened border. In narrow lateral 

 view convex, tapering from the broadest diameter in 

 nearly straight lines — sometimes slightly convex and 

 then concave — downwards to the notched mouth. The 

 entire surface covered with plates of varying pattern, 

 mostly circular. Plasma colourless, always containing 

 a quantity of chlorophyllous particles, large and small, 

 mixed with oil-like globules and some granular matter, 

 but never veiy dense. Pseudopodia thin, blunt, four 



