HYALOSPHENIA PAPILIO. 83 



Hyalosphenia papilio, in common with nearly all 

 the members of the genus, is most abundant in sub- 

 alpine bogs. It is a beautiful form. Leidy says 

 that, in giving the species the name it bears, he 

 " associated it with the idea of a butterfly hovering 

 among flowers." Its fairy-like movements, under the 

 microscope, quite justify the appellation. 



2. Hyalosphenia cuneata Stein. 

 (Plate XXXI, figs. 1-4 ; and fig. 80 in text.) 



Hyalosphenia cuneata Stein in Sitzber. bohm. Akad. Wiss. 

 X (18.57), p. 42; Leidy Preshw. Ehiz. N. Amer. (1879), 

 p. 129, t. XX, ff. 1-10; Hitchcock Synops. Fresbw. Rhiz. 

 (1881), p. 17; Taeanek in Sitzber. bohm. Akad. Wiss. 

 1881 (1882), p. 229; Blanc in Bull. Soc. Vaudois, (2) 

 XX (188.5), p. 288; Foeel Faune Lacs Suisse (1885), 

 p. 131 ; and Le Leman (1904), III, pp. 1-36, 138; Ceetes 

 Prot. in Mission scient. Cap. Horn, VI, 3 (1889), p. 20 

 Penaed in Arch. Sci. nat. (4) VII (1899), p. 257 etc.; in 

 Eev. Suisse Zool. VII, 1 (1899), p. 46, t. iv, ff. 17-19 

 Faune Ehiz. Leman (1902), p. 333, ff. 1-7; and Sarc 

 grands Lacs (1905), p. 37, 2 S. (p. 38) ; ByPEETH Natur 

 gesch. mikr. Siisswass. ed. 3 (1900), t. ix, f. 11; G-. S 

 West in Jrn. Linn. Soc, Zool. XXVIII (1901), p. 325 

 Zykoff in Bull. Soc. Nat. Moscou, XVII (1903), p. 15 

 AvEEiNTZEV in Trudui S.-Peterb. Obshch. XXXVI (1906) 

 2, p. 229 ; Schouteden in Ann. Biol. Lacustre, I, 3 (1906) 

 pp. 351, 352, f. 24; Hoogbneaad in Tydschr. Nederl 

 Dierk. Ver. (2) X, 4 (1908), p. 408. 



Arcella ohlonga Lachmann in Verb, nat. Ver. Eheinl. XVI 

 (1859), p. 60. 



Difflugia ligata Tatem in M. Micr. Jrn. IV (1870), p. 313, 

 t. Ixviii, f. 1. 



Catharia ligata Leidy in Pr. Acad. Philad. 1874, p. 79 ; and 

 op. cit. 1875, Y>.4,^b. 



Hyalosphenia lata F. B. Schulze in Arch. mikr. Anat. XI, 

 2 (1875), p. 335, t. xviii, ff. 15-18; Leidy in Proc. Acad. 

 Philad. 1875, p. 415 ; Aechee in Q. Jrn. Micr. Sci. (n.s.) 

 XVII (1877), p. 110, t. viii, f. 5; and in Jrn. Dublin 

 Micr. Club, III, 2 (1877), p. 228, t. viii, f. 5 ; Botschij in 

 Bronn's Thier-Eeichs, I, 1 (1880), t. ii, f. 10; Aveeintzev 

 in Trudui S.-Peterb. Obshch. XXX, 1 (1900), p. 229 ; and 



