BY G. I. PLAYPAIR. 651 



Guildford (23); Lismore (337). 



Syn., D. tuberculata forma, Penard, Faune Rhiz., p. 'J 95 (70-SO/x 

 long\ The test is composed of rectangular plates, splinters, and 

 fine grains, the collar of fine grains only. 



DiFFLUGIA ACUMINATA Ehr. 



Length 170-252, breadth 52-120, orif. 30-50//. 



Guildford; Lismore (327, 337). 



Very rare here, as is also D. pi/riformis Pert3^ Only two 

 examples of the latter noted, from the Sydney Water-Supply (66), 

 and Kyogle(217),; length 82-250, breadth 52-175, orif. 23-90/x. 

 Var. Levaxderi Playf. 



Length 190, breadth 60, orif. 48/x; Biol. Richm. R., PI. viii., 

 f.lO; Levander, Wasserfanna, T, i., f.7. This has some likeness 

 to D. curincaulis Penard, Faune Rhiz., p. 243. 



DiFFLUGiA gibberosa, n.sp. (PL xxxvii., f.l2, 13). 



Test very asymmetrical, irregularly ovate ; dome broadlj'' 

 rounded, sides converging almost up to the orifice, just above 

 which the test is constricted slightly to form a collar, at one side 

 a short, conical process. Orifice circular, simple. 



Length 82-100, breadth 72-84, orif. 23-28//. 



Coogee (58); Lismore (338). 



This might appear simply a monstrous form, but its occurrence 

 in two widely separated districts forbids this view. The test in 

 both instances was plated, in the one, of angular plates of irregu- 

 lar shape and size; in the other, a very beautiful test, of large, 

 clear, more or less rectangular plates, the interspaces filled with 

 smaller, irregular pieces, and the angles filled in with minute 

 grains. 



DiFFLUGiA GLOBULUS (Ehr.) Hopkinson. 



Syn., D. f/lobulosa (of various authors, not D. globulosa Duj.); 

 D. globularis Wallich. Of. Leidy, Rhiz. U.S.A., PL xvi., f.1-10; 

 Penard, Faune Rhiz., p. 258, f.l. 



Var. Cashii, n.var. (PL xxxvii., f.l 4, 15). 

 Test globular, very small and chitinous, studded with very fine 

 grains, which are generally widely scattered. Orifice circular, 



