DIFFUTGTA LUCIPA. 33 



The test of this species differs from those of other 

 Diffluglsz in being evenly compressed, so much so that 

 the two sides, when the test is viewed laterally, are 

 nearly parallel from the crown to the oral aperture. In 

 broad view individuals differ in the degree of contrac- 

 tion anteriorly ; in British examples they are narrower, 

 in proportion to the diameter below the crown, than 

 Penard represents in his figures of continental ex- 

 amples, though in other respects no disparity is notice- 

 able. The test when empty is bluish grey in colour, 

 shining, transparent, and with no adventitious matter 

 adhering except filmy siliceous particles. 



13. Difflugia globulus (Ehrenberg).* 

 (Plate XXI, figs. 5-9 ; and figs. 52-54 and 110 in text.) 



Arcella globulus EHRENBERG in Monatsb. Akad. Wiss. 

 Berlin, 1848, p. 379 ; op. cit. 1856, p. 337, t., f. 4 (; ? idem, 

 Mikrogeol. (1854), t. xxxiv, f. ii, 2; t. xxxviii, f. xxi, 9). 



Difflugia proteiformis sub-sp. globularis WALLICH in Ann. 

 Nat. Hist. (3) XIII (1864), p. 241, t. xv, f . 4 h t. xvi, 

 if. 1, 2, 17, 21. 



Difflugia globularis LEIDY in Pr. Acad. Philad. 1377 (1878), 

 pp. 307, 321. (Non D. globularis KHRENBERG in Abh. Akad. 

 Wiss. Berlin, 1871 (1872), p. 253, t. iii, f. 24.) 



Difflugia globulosa (L)uj.) LEIDY (pars) Fresliw. Rhiz. N. 

 Amer. (1879), p. 96, t. xv, ff. 29, 30 ?; t. xvi, ff. 1-10, 

 21-24; BUTSCHLI in Bronn's Thier-Reichs, I, 1 (1880), 

 t. iii, f. 1 ; HITCHCOCK Synops. Fresh w. Rhiz. (1881), p. 

 11; TARANEK in Sitzber. bohm. Ges. Wiss. 1881 (1882), 

 p.226; DETARR in Rep. N.York State Mus. XXXV (1884), 

 p. 165; JICKELI in Zool. Anzeig. VII (1884), p. 449; in 

 Ann. Nat, Hist. (5) XIV (1884), p. 297 ; and in Jrn. R. 

 Micr. Soc. (2) IV (1884), p. 911; BLANC in Bull. Soc. 

 Vaudoise (2) XX (1885), p. 288; in Ann. Nat. Hist. (5) 

 XV (1885), p. 427; in Arch. Sci. nat. (3) XXVI (1891), 

 p. 577; op. cit. (3) XXVII (1892), p. 472; and Difflugies 

 Lac Leman (1892), p. 3, t. ii, ff. 7-10, 16-20 ; BLOCHMANN 

 Mikr. Thierw. Siisswass. (1886), p. 12, t, i, f. 18 ; ed. 2 

 (1895), p. 16, t.i,f. 15 ; FIELDE in Pr. Acad. Philad. 1887, 

 p. 122; FOREL in Boll. Scierit. Ill, an. 9 (1887), p. 90; 



* [Dijflugia globularis Wallich : CASH, MS.] 

 VOL. II. 3 



