HTALOSPHENIA PAPILIO. 83 



HyaZosphenia 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 (1857), p. 42; LEIDY Freshw. Rhiz. N. Amer. (1879), 

 p. 129, t. xx, if. 1-10 ; HITCHCOCK Synops. Freshw. Rhiz. 

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

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

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

 p. 131 ; and Le Leman (1904), III, pp. 136, 138; CERTES 

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

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

 Rev. Suisse Zool. VII, 1 (1899), p. 46, t. iv, if. 17-19; 

 Faune Rhiz. Leman (1902), p. 333, if. 1-7; and Sarc. 

 grands Lacs (1905), p. 37, 2 if. (p. 38) ; EYPERTH 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; 

 AVERINTZEV in Trudui S.-Peterb. Obshcli. XXXVI (1906), 

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

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

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



Arcella oblonga LACHMANN in Verh. nat. Ver. Rheinl. 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, p. 415. 



Hyalosphenia lata F. E. SCHULZE in Arch. mikr. Anat. XI, 

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

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

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

 Micr. Club, 111,2 (1877), p. 228, t. viii, f. 5 ; BUTSCHIJ in 

 Bronn's Thiei'-Reiclis, I, 1 (1880), t. ii, f. 10; AVERINTZEV 

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



