652 RHIZOPODS OF SYDNEY AND LISMORE, 



simple, sharp-edged, as a rule not margined with flints, some- 

 times smaller than the base. 



Length 21-30, breadth 19-31, base ( = orif.) 6-18; or base 1 1-21, 

 orif. 6-1 6ft. 



Auburn (68): Botany (17); Coogee (U, 93); Lismore(181, 273, 

 274, 316). 



This is the very small, chitinous form figured b}- Cash, I.e., ii., 

 PI. xxi., f.8, 9, whose figure works out at 30/x broad. It is very 

 common and widespread here, while I have never met with a 

 specimen anj^thing near the size of the type (30 x 34, my largest) 

 which Penard gives as 70-100/x, and Leidy 65-260/a. The latter 

 mentions these small, chitinous tests at about 24 x 32//.. Their 

 very small size, delicate test, and orifice smaller than the trun- 

 cate base give them a claim to be set apart as a distinct variation. 



DiFFLUGiA PULEX Pcuard. (PL xxxvi., f. 13). 



Length 24-42, breadth 16-24, orif. 7-13//. 



Auburn (139&, 159); Clyd«^, I>"ck Creek (26); Guildford (23); 

 Lismore (185). 



Var. CUNEATA, nom.nov. (PI. xxxvi., f.l4). 



Test cuneate, not pyriform; sides straight; rounded behind. 



Length 30-42, breadth 15-25, orif. 9-1 5/j.. 



Auburn (139^); Clyde, Duck Creek (26). 



Penard, Faune Rhiz., p. 230, f.4, who gives length 22-30/^; ours 

 were all above 30fi, except one specimen, which was of doubtful 

 identity. 



DiFFLUGIA MITRATA, n.Sp. (PI. XXXvii., f.l6). 



Test small, mitriform, broadly ovate, with hemispherical dome, 

 and sides converging almost straight to the truncate base. Orifice 

 full breadth of the base, circular, simple, sharp-edged. Test 

 chitinous, studded with small flints, orifice not margined, as a 

 rule. 



Length 21-24, breadth 19-26, orif. 8-1 2/x. 



Botany (17, 109); Lismore (308). 

 Var. MA.TOR, n.var. 



Test twice as large; orifice, however, not proportionately so. 



