BY G. I. PLAYFAIR. 667 



(in division) being drawn apart before silicification was complete. 

 The exact formation of the orifice, I found very dilHcult to make 

 out, and only achieved it with the yV <^^1 inim. obj., aided by the 

 condenser. 



Var. HAMULIFERA Playf. (PL xli., f.4). 



8yn., Euglypha alveoJafa var. haimdifera Playf., Biol. Richm. 

 R., p.l43, PI. viii., f.l3. Test ovate (rarely elliptical?), broadly 

 rounded behind; sides arched, converging rapidly to the mouth. 

 Apical scales distinct, angular, pointed, apparently siliceous, but 

 edges not serrate, 4 visible. Body-scales circular, same size, 

 character and overlap exactly as in var. elonyata above; a minute 

 foramen .showing in this form, however, at the intersection of 

 every three scales. 



Length 45-60, breadth 24-38, orif. lOf LSJ/x. Lismore(197). 



In sample 1956, along with var. elongata, is found more rarel}^ 

 an ovate form, in shape agreeing with Wailes' figure, I.e., PI. 43, 

 f.l5, but all other details as in our Australian specimens, size 

 44x25, orif. 9/x; (PI. xli., f.3). 



Genus Sphenoderia Schlumberger. 

 Sphenoderia australis, n.sp. (PI. xli., f.5, 6). 



Test very broadly ovate or subglobose, very slightly comjjressed 

 if at all, broadly rounded behind; sides strongly arched, con- 

 verging to the orifice. Orifice a mere slit at the apex of a struc- 

 tureless collar. Body-scales of varying sizes and shapes in the 

 same test, and without any regular arrangement, overlapping 

 slightly. Side-view ovate. 



Length 57-70, breadth 32-60, collar 17-28, 5-6//. high. 



Coogee; Centennial Park (6, 11); Guildford (77); Lismore(298, 

 308). 



This is the common Sj^henoderia of this country; S2^h. lenta I 

 have never seen. Our form is sufficiently distinguished from the 

 latter by the irregular disposition of the scales, and their varying 

 size and shape. At their best, they exhibit a tendency to be 

 circular. 



Sphenoderia foveosa, n.sp. (PI. xli., f.7). 



Test broadly ovate, rounded everywhere, slightly compressed. 



