70 BRITISH FRESHWATER RHIZOPODA. 



tinguished from the next species by the transparency 

 of all its parts, the surface of the test being void of ex- 

 traneous matter. Cosmopolitan in habit and indifferent 

 as to climate, it has been reported from the Rocky 

 Mountains and other parts of North America, from 

 all parts of the European Continent, and even from 

 Australia. Referring to the test, Leidy, in ' Freshw. 

 Rhiz. N. Amer.,' says : " Though not strictly correct 

 to call it spiral, the constriction of the neck, especially 

 when viewed by transmitted light, gives rise to such an 

 impression ; and this led Ehrenberg so to name it, and 

 likewise Bailey after him, apparently without knowing 

 that the former had done so." 



2. Lesquereusia modesta Rhumbler. 



(Plate XXII, fig. 15; PI. XXIII, fig. 9; and figs. 35 

 and 74 in text.) 



Difflugia LECLEBC (pars) in Mem. du Mus. II (1815), p. 447, 



t. xvii, f. 1 a (? ff. 1, 4). 

 Difflugia spiralis EHKENBERG ? in Monatsb. Akad. Wiss. 



Berlin, 1840, p. 199. 

 Difflugia proteiformis tnonstrosa PERTY Kenntn. kleinst. 



Lebensf. (1852), p. 187, t. viii, f. 22. 

 Difflugia helix COHN (? pars) in Zeits. wiss. Zool. IV, 3 



'(1853), p. 261. 

 Difflugia spiralis FRESENIUS (pars) in Abh. Senkenb. nat. 



Ges. II (1858), p. 224 ; CARTER (pars) in Ann. Nat. Hist, 



(3) XIII (1864), p. 29, t. i, f. 9; LEIDY (pars) Freshw. 



Rhiz. N. Amer. (1879), p. '127, t. xix. f. 23; EDMONSTON 



in Pr. Davenport Acad. Sci. XI (1906), p. 16, t. iii, f. 18 ; 



LANDACRE in Pr. Ohio Acad. Sci. IV, 10 (1908), p. 428. 

 Difflugia (Corticella] spiralis EHRENBERG? in Abh. Akad: 



Wiss. Berlin, 1871 (1872), pp. 247, 274, t, iii, 1, ff. 



25-27. 

 Lecquereufia spiralis TARANEK (pars) in Sitzber. bolim. Ges. 



Wiss. 1881 (1882), p. 228; and in Abh.bohm. Ges. Wiss. 



(6) XI (1882), 8, p. 53, t. v, f. 5, 12, ? 17 ; RHUMBLER 



(pars) in Zeits. wiss. Zool. LI I, 4 (1891), p. 523 etc., 



t. xxxii, ff. 14-17 ; LAGERHEIM (pars) in Forh. Geol. Foren. 



Stockholm, XXIII, 6 (1901), p. 514. 

 Lecquereusia modesta RHUMBLER in Zeits. wiss. Zool. LXI, 1 



