BY G. I. PI-AYJi-AlR. 831 



of their probable connection with Pediaatrnvi, it is convenient 

 to arrange these forms under a separate genus, even if it is only 

 a conventional one. Those mentioned, I.e., these Proceedings, 

 1913, may be summarised thus: — 



Ckucigenia austicalis mihi. 

 8yn., Pedi. tetras var. australe Playf., I.e., p. 516, PI. 56, f.2. 



Ckucigknia tetkapedia (Kirch.) W. »fc G. 8. West. 



Ccjenob. (4 cell.) long. 7-8, lat. 7-8/x. 



Fairfield (130). 



8yn., Pedi. tetras var. tetrapedia (Kircli.) Playf., I.e., p. 517, 

 P1.56, f.3; also Pedi. tetras var. qnadratrmi Playf., ibid., P1.56, 

 f.3a, which differs hardly at all from (J. tetrapedia. 



Var. OKNATA, n.var. (PI. Ivii., f.3). 



Coenobium (4 cell.) parvo cytoplasmatis granulo ad angulos 

 ornatum. 



Ccenob. long. = lat. = 7-8/x. Fairfield (130). 



The coenobium of C. tetrapedia is formed from a single cell by 

 the gradual division of the contents into four, from tlie centre 

 outwards. The last sign of this division is a slight band of 

 cytoplasm coiniecting the outer angles of the cells. Cf. Chodat, 

 Alg. vertes, p.222, f. 148a, No.2 (sub noni. Lnnniermamiia etnar- 

 (j'luata) and my figure in Plankton Sydney Water-Supply, PI. 56, 

 f.3 {Pedi. tetras var. tetrapedia). The small, chlorophyllaceous 

 granule found in var. ornata seems to be brought about by the 

 segregation of this band. 



Ckucigenia floralis, nom.nov. 



Cu?nobium in medio foramine parvo rectangulari instructum; 

 cellulis binis rotundato-ovatis, alteris oblongis, cruciatim dis- 

 positis. 



Ccenob. long. 8, lat. 7/x. Potts Hill (138). 



Syn. Pedi. tetras var. triangidaris (Chod.) Playf., forma. I.e., 

 p.517, PI. 56, f.5. This form is not strikingly like Craciyeuia 

 triangulai'is Chodat, although the upper and lower cells are 

 somewhat o\ate. 



