ZONOMYXA VIOLACEA. 159 



since Niisslin's discovery in 1882, authors have been 

 too hasty in assuming its identity with Amphizonella. 

 It is met with in Sphagnum, whilst A. violacea affects 

 more the aquatic mosses of the margins of ponds. 



The envelope has no visible orifice, as the author 

 cited points out ; it is exceedingly thin at the anterior 

 extremity, and the converging lips are thrust apart by 

 the lobe of ectoplasm which forms the single pseudo- 

 podium, the limit of the membranous envelope being 

 indicated, as it emerges, by a fine transverse line. 



The pyriform body, when the organism is active, 

 the simple envelope, and the multinuclear plasma, 

 sufficiently distinguish this species from Ampliizonella 

 violacea Greeff. 



B. DlFFLUGINA. 



[(p. 48) 18 a. Difflugia tuberculata (Wallich) 

 Archer. 



(Figs. 105 and 106.) 



Difflugia proteiformis sub-sp. globularis var. tuberculata 



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



f. 4g ; t. xvi, f . 18. 

 Difflugia tuberculata ARCHER in Q. Jrn. Micr. Sci. (n.s.) VII 



(1867), p. 177; and in Jrn. Dublin Micr. Club, I, 2 



(1867), p. 121 ; AVERINTZEV in Ber. Siisswass. nat. Ges. 



St. Petersb. I (1901), p. 212, t. iv, ff. 19, 20; and in 



Trudui S.-Peterb. Obshch. XXXVI (1906), 2, p. 182; 



PENARD Faune Ehiz. Leman (1902), p. 291, fp. 1-6 (p. 



292); SCHOUTEDEN in Ann. Biol. Lacustre, I, 3 (1906), 



pp. 341, 345. 

 Difflugia lobostoma LEIDY (pars) Freshw. Rhiz. N. Amer. 



(1879), p. 115, t. vi, ff. 21, 22; VERWORN in Zeits. wiss. 



Zool. L, 2 (1890), p. 443, t. xviii. 



Difflugia lobostoma var. tuberculata MINKIEWICZ in Zool. 

 Anzeig. XXIII (1900), p. 620. 



Test ovoid laterally, in transverse section circular, 

 mamillated throughout with subhemispherical eleva- 

 tions exteriorly and corresponding depressions in- 



