70 BRITISH EEESHWATEE EHIZOPODA. 



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 fi-om 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.) 



Diffliigia Lkclerc (pars) in Mem. du Mus. II (1815), p. 447, 



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

 Difflugia spiralis Ehhenbeeg ? in Moiiatsb. Akad. Wiss. 



Berlin, 1840, p. 199. 

 Dijjiugia proteiforniis monstrosa Peety Kenntn. kleinst. 



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

 Difflii.gia helix Cohn (? pars) in Zeits. wiss. Zool. IV, 3 



(1853), p. 261. 

 Difflugia spiralis Fresenids (pars) in Ahh. Seiikenb. nat. 



Ges. 11 (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. 

 Lecquereusia 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; Rhumblkr 



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



t. xxsii, ff. 14-17 ; Lagerheim (pars) in Forh. Geo!. Foren. 



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

 Lecquereusia modesta Rhumbler in Zeits. wiss. Zool. LXI, ] 



