524 PLANKTON OF THE 8YDNEY WATER-SUPPLY, 



occur also in Oocyntis solitaria, Ereniosphaira viridis, and in a 

 marine diatom (unidentified) lately obtained from Hyde, the two 

 forms in the same gathering. Var. acuminata is the shape 

 generally found in small cells with only two or thi-ee setae, and is 

 the commonest form for aplanospores in the plankton. A single 

 cell was noted with the setse just commencing as minute tubercles 

 (PI. liii., f.l8). Also a f. decussata mihi was observed with two 

 pairs of setae arranged decussately. The mother-cells, when fully 

 developed, are spherical, either with or without an apiculus; 

 occasionally one is found depressed vertically. 



Var. suBSALSA(Lemm.) mihi, forma. 



Forma var. acuminatce ccnsimilis, ternis autem setis utroque 

 polo instructa. Cellula matricalis (matura) globosa, interdum 

 utroque polo levissime acuminata vel apiculo minuto instructa. 



Cell, matric. long. 16-18; lat. 14-18; setse ad 30//.. 



Apian, long. 8-10; lat. 6-7; setse ad 22 fx. 



This is the Australian form of Ch. subsalsa Lemm., Forsch, 

 biol. Stat. Plon., vi., T.5, f.2-6. Cf. also G. S. West, Third Tan- 

 ganyika Exp., PI. 5, f. 14-1 7. 



Forma mixta 1, var. subsalsa{Lemm.) + var. acuminata mihi. 



Cell, matric. long. 12; lat. 14; setae ad 20 /x,. 



Apian, long. 8-10; lat. 7; setss ad :^0 //. (PI. liii., f.27). 



Forma mixta 2, var. siibsalsa(Licmm.) + L. ciliata{type). 

 Cell. long. 7-10; lat. 6-8 /x. (PI. liii., f.28). 



Var. GLOBOSA n.var. (PI. liii., f.20). 



Cellula matricalis elliptica, utrocjue polo acuminata; setis binis 

 ad polos instructa. Aplanosporis globosis. 



Cell, matric. long. 1 1 ; lat. 8; setae long. 27 /x. 



Apian, diam. 5-6; setae 20 /x. 



The mother-cell with two globose aplanospores was found in 

 exceedingly shallow water at Gardener's lload, liotany. A 

 globose cell with setae was noted in the plankton. It is only an 

 accidental fcjrmation occurring in a very young cell. In this 

 case, the mother-cell only measured 10x8, whereas aplanospores 

 within the matrix often measure 10x6. Cells need not be full 



