BY G. I. PLAYFAIR. 657 



Length 10-13, breadth 8-9, rim of the urif. 2-3/x. 

 Auburn (159); Lisinore (258). 



Cryptodifflugia angulata, n.sp. (PI. xxxviii., f.l4). 

 Test ovate, rather angular at the sides, conically rounded 

 behind; sides converging strongly, and turned in at the orifice, 

 which is very small. Membrane smooth. Length 13-14, breadth 

 10/x. Guildford (77). 



Cryptodifflugia sacculus Penard, form;e. 



Length 23-30, breadth 17-22, neck 10-12, orif. 12 -U, rim 4-8/y. 

 high. 



Centennial Park (72, 133); Clyde, Duck Creek (26). 



Another very rare form recorded only from Switzerland. Oui- 

 specimens, while exhibiting a general likeness, are \ery variable 

 in shape (PL xxxviii,, f. 15). 



Cryptodifflugia valida, n.sp. (PL xxxviii., f.lG). 



Test ovate, circular in section; dome circular; sides arched, 

 rapidly converging to the abi-uptly truncate base; no neck, con- 

 striction or collarette. Orifice circular. Membrane pale rufes- 

 cent, smooth, no markings, thickened at the orifice, where it has 

 the appearance of being doubled over. 



Length 55, breadth 40, orif. 15/x. Botany (151). 



I have seen only the empty test, but it agrees in character 

 with other species of this genus. 



Cryptodifflugia crenulata, n.sp. (PL xxxviii., f.l7, 18). 



Test ovate, with truncate base, above which it is sometimes 

 slightly constricted to form an obscure neck, end-view circular, 

 crenulate. Membrane smooth, thick, chitinous, hyaline or })ale 

 yellow, indented all over so as to appear broadly crenulate in 

 optical section, both front and end. Orifice circular, sijnple, 

 slightly smaller than the base. 



Length 17-20, breadth 14-16, base 6-9/;.. Lismore (195/v). 



Cf. Platoum sp., Penard, Faune Rhiz., p.430. Obtained in 

 quantity out of weeds in the Richmond River. A nucleus( x 4/x) 

 was noted in one specimen, containing a gi'anule( x 1 J/x). The 



