BY G. I. PLAYFAIR. 64:1 



Diara. 50-80, alt. 31-48: orif. 13-20, alt. 6-10//. 



Auburn (57); Lismore (260, 308, 327, 337); Woodlawn (225). 



The type, and var. angulosa Perty, are very rare; I have seen 

 hut one or two specimens. Var, co'tiica seems to be very rare 

 round Sydney, but fairly common in the Lismore district. 



Arcella mitrata var. depressa, n.var. 



Test in side-view inflated above the base, but not so much as 

 in the type, dome often much depressed above. Sides diverging 

 from the base at a decided angle. Sometimes very slightly con- 

 stricted above the base, enough to form a rectangular neck, as in 

 the type. (PI. xxxiv., f.l8, 19). 



Diam. 32-42, alt. 20-30; orif. 9-12, alt. 4 6/x. 



Botany (37, 152); Lismore (337); Wyrallah (310). 

 Var. ANGULATA, n.var. (PI. xxxiv., f.20). 



Dome in side-view angular at intervals, by reason of a series 

 of wide, shallow depressions, which cover the surface. 



Diam. 72, alt. 59; base 65/x. Lismore, very rare. 



Genus Leptocystis, gen.nov. 

 Leptocystis arcelloides, n.sp. 



Test minute, spherical, truncate below; orifice centrical, the 

 whole width of the base, shortly 

 invaginate, the inner rim strongly 

 everted. Membrane pink, trans- 

 parent, smooth, without a trace of 

 structure. 



Diam. 20, alt. 19, base 12^; orif. rig.4. 



12-| (rim), alt. 4/x. Leptocystis arcelloides, gen. nov. 



Guildford (77). et sp. ; {a) end-view; ( x 900). 



I have seen only the empty test, but its minute size, the 

 cliaracter of the orifice, and, above all, the structureless, trans- 

 parent membrane, which shows no markings even under the jV 

 oil imm. obj., seem to mark it off from the genus Arcella. 



Genus Pyxidicula Ehr, 

 Pyxidicula scutella, n.sp. 

 Test minute, very depressed, almost saucer-shaped; dome very 

 slightly arched above, rounded at the sides, slightly broader 



