DIFFLUGIA CONSTRICTA. 55 



(1872), p. 144; in Ber. Akad. Wiss. Berlin, 1853, p. 332; 

 and Mikrogeol. (1854), t. xxxix, infra, f. 3. 



Difflugia proteiformis sub.-sp. mdrsupiformis WALLICH in 

 Ann. Nat, Hist. (3) XIII (1864), p. 241, t. xv, f. 5 a, 

 t. xvi, ff. 3-5 ; LEIDY in Pr. Acad. Pliilad. 1877 (1878), 

 p. 307 ; LAGERHEIM in Forh. Geol. Foren. Stockholm, 

 XXIII (1901), p. 512. 



Difflugia proteifurmis sub.-sp. marsupiformis var. cassis 

 WALLICH in Ann. Nat. Hist. (3) XIII (1864), p. 241, t. xv, 

 f. 5 6, c; t. xvi, f. 6; LEIDY in Pr. Acad. Philad. 1877 

 (1878), p. 321. 



Arcella (Homoeochlamys) constricta EHRENBERG in Abth. 

 Acad. Wiss. Berlin, 1871, p. 244. 



Difflugia constricta LEIDY (pars) Freshw. Rim. N. Amer. 

 (1879), p. 120, t, xviii, ff. 1-36, 45-57; in Proc. Acad. 

 Philad. 1879, p. 163; and op. cit. 1880, pp. 335, 338; 

 HITCHCOCK Synops. Freshw. Rhiz. (1881), p. 15 ; DE TARK 

 in Rep. N. York State Mus. XXXV (1884), p. 166?; 

 DAD AY in Ertesz. math, termesz. Akad. Budapest, III 

 (1885), p. 161; and in Sitzber. Acad. Wiss. Wien, CXII, 

 1 (1903), p. 140 ; BLOCHMANN Mikr. Thierw. Siisswass. 

 (1886), p. 13, t. i, f. 14; ed. 2 (1895), p. 16, t. i, f. 18; 

 IMHOF in Jahresb. nat. Ges. Graubiind. XXX (1887), p. 

 65; Zool. Anzeig. XI (1888), p. 565; and in Arch. Sci. 

 nat. (3) XXX (1893). pp. 649, 650; GREEFF in Sitzber. 

 Ges. Nat. Marburg, 1888, 3, p. 108 ; GUERNE Excurs. 

 zool. Fnyal et San Miguel (1888), pp. 32, 72; SACCHI in 

 Boll. Scient. Ill, an. 11 (1889), p. 68 ; and in Jrn. Microg. 

 XIV (1890), p. 109; PENARD in Mem. Soc. Geneve, XXXI 

 (1890), 2, p. 148, t. v, ff. 1-16; in Jahrb. nassau. Ver. 

 Naturk. XLIII (1890), p. 70; in Arch. Sci. nat. (3) 

 XXVI (1891), p. 143; op. cit. (4) VII (1899), p. 262 

 etc.; in Amer. Natur. XXV (1893), p. 1070 etc.; Faune 

 Rhiz. Leman (1902), p. 298, ff. 1-16 (p. 299); in Arch. 

 Protist. II (1903), p. 256; and in Pr. R. Soc. Edinb. XXV 

 (1905), p. 594; FRENZEL in Arch. mikr. Aiiat. XXXVIII 

 (1891), p. 12 ; RHDMBLER in Zeits. wiss. Zool. LII, 4 (1891), 

 p. 518; and op. cit. LXI, 1 (1895), pp. 38, 46; CASH in 

 Tr. Manch. Micr. Soc. 1891 (1892), p. 48; LEVANDER in 

 Arch. Ver. Mecklenb. XLVI (1892), p. 114; in Zool. 

 Anzeig. XVII (1894), p. 210; in Acta Soc. Fauna Fenn. 

 XII (1894), 2, p. 18 ; and op. cit. XX (1901), 5, p. 7 etc., 

 and 6, p. 5; LORD in Tr. Manch. Micr. Soc. 1891 (1892), 

 p. 55; SCHEWIAKOFF in Mem. Acad. Sci. St. Petersb. (7) 

 XLI (1893), 8, p. 98 ; ZACHARIAS in Forschb. zool. Stat. 



