8 BRITISH FRESHWATER RHIZOPODA. 



Encystment tests which measure 1 10-125 /x in length 

 occur ; they are the result, according to the observa- 

 tions of Penard, of the plastogomy of two individuals, 

 and contain an oviform cyst the test of which is com- 

 posed of oval scales and is about the size of a normal test. 



a b c 



FIG. 111. Body-scales of Euglypha scutigera. x 900. a, normal form ; 

 b, intermediate form ; c, rudimentary form. 



2. Euglypha acanthophora (Ehrenberg) Perty. 

 (Plate XXXIII, figs. 3-5, and PI. XXXV, fig. 2.) 



Euylypha alveolata 



DTJJARDIN (pars) Zooph., Infus. (1841), p. 252, Atlas, p. 2, pi. ii, f. 9. 

 GRIFFITH & HENFREY Microg. Diet. (1855), p. 247, pi. xxiii, f. 54 



ed. 4 (1883), p. 306, pi. xxx, f. 54. 



LACHMANN in Verb. Yer. Rheinl. XYI, Sitzber. (1859), p. 93. 

 PRITCHARD Hist. Infus., ed. 4 (1861), p. 556, pi. xxi, f. 11. 

 LEIDY in Proc. Acad. Philad. 1874 (1875), p. 225; op. cit. 1877, pp. 262- 



264; (pars) 1878, pp. 171-172; (pars) Freshw. Rhiz. N. Amer. (1879), 



pp. 207-214, pi. xxxv, ff. 7, 8, 15-17. 



SCHULZE in Arch. mikr. Anat. XI (1875), pp. 97-101, pi. v, ff. 1, 2. 

 GABRIEL in Morph. Jabrb. 1 (1876), p. 539. 

 STRASBURGER in Jena. Zeitschr. X (1876), p. 413. 

 BUETSCHLI (pars) in Bronn's Tbierreicbs, I, 1 (1880), pi. iii, f. 12 a. 

 GRUBER in Zool. Anzeig. Ill (1880), pp. 582-584. 

 HITCHCOCK (pars) Synops. Freshw. Rhiz. (1881), pp. 35-36. 

 TARANEK (pars) in Sitzber. bohm. Ges. Wiss. 1881, pp. 224,233. 

 BLOCHMANN Mikr. Tbierw. Siisswass. (1886), p. 14, pi. i, f. 29 ; ed. 2, 



p. 18, pl.i, f. 22. 



LUDWIG in Leunis' Synops. Tbierkunde, ed. 3 (1886), p. 1170, f. 1156. 

 LORD (pars) in Sci. Gossip, XXVII (1891), p. 276, f. 216. 

 FRENZEL (pars) in Bibl. Zool. IV, xii (1897), 1, pp. 137-140, pi. ix, f. 17. 

 STENROOS in Acta Soc. Fauna Fenn. XVII (1898), i, pp. 36, 85, 233. 

 PENARD (pars) in Rev. Suisse Zool. VII (1899), pp. 13, 105-121 passim; 



(pars) in Arch. Sci. nat. (4) VII (1899), pp. 253, 264, 265, 267 ; (pars) 



in Brit. Antarct. Exped. I, 6 (1911), pp. 220, 233. 

 EYFERTH Einfach. Lebensf. ed. 3 (1900), p. 266, pi. ix, f. 14. 

 CALKINS (pars) Protozoa (1901), pp. 40, 47, 90, ff. 13D, 17 D; Proto- 

 zoology (1910), p. 23, f. 5 A. 



ISSEL in Atti Soc. Torino. XXXVI (1901), pp. 64, 68. 

 WEST (pars) in Jrn. Linn. Soc., Zool. XXVIII (1901), p. 327. 

 CUSHMAN & HENDERSON (pars) in Amer. Natur. XXXIX (1905), p. 154. 

 COCKERELL (pars) in Univ. Colorado Stud. IV (1907), p. 262. 

 BROWN (pars) in Naturalist, 1909, p. 107; (pars) in Brit. Assoc. Handb. 



Sheffield (1910), pp. 500, 501. 

 POPOFF in Arch. Protist. XXV (1912), pp. 8-26, pis. i, ii, text-ff. A-H. 



