BY G. I. PLAYFAIR. 797 



dull violet blue, not blue-green. Accompanying them were otbers 

 of similar size and sbape but with the usual yellow-brown cbroma- 

 topbores. The movements of the two were widely different 

 however, the blue form darting rapidly here and there in a very 

 lively manner indeed. 



Long. 30, lat. 25 p. Botany (108) . 



Gymnodinium paradoxum Schilling. (Text-fig. lb)- 



Forma parte anteriore latissime rotundata, altius crateriformi, 

 parte posteriore magis depressa, fossa transversa niagis dis- 

 tincta . 



Long. 38, lat. 34 ^. Lismore (347). 



Exactly the size recorded by Schilling, I.e., p. 18, f. 15, who 

 gives long. 39.7, lat. 34.5 p. Our form however has the anterior 

 part more broadly rounded, deeply bowl-shaped and the hinder 

 part depressed, transverse groove a little more pronounced. 

 Chromatophores yellow-green. Noted in some quantity from a 

 swampy pool. 



Gymnodinium australe mihi. (Text-fig. 2 a). 



Gymnodinium magnum, parte anteriore alte campanulata, sur- 

 sum late rotundata; lateribus fere rectis; parte posteriore trian- 

 gulari pone acuminata interdum apiculata. Chromatophoris 

 luteo-fuscis vel luteo-viridibus, stigmate millo. 



Long. 53-56, lat. 36-38 p. 



Sydney Water Supply; Botany (92); Lismore (316). 



Syn. G. fuscum var. comifax (Schilling) Playf. in Plankt. 

 Sydney Water, these Proceedings 1912, p. 545, PL lvii., f. 18, 19. 

 A fine large species generally distributed here and apparently 

 more common than any other. It has points of resemblance 

 both with G. fuscum (Ehr) Stein, and with Gym. (Cystodinium) 

 comifax Schilling, but as it everywhere retains its own charac- 

 teristics I have decided to give it a name. The anterior portion 

 is deeply bell-shaped, broadly rounded above, with nearly straight 

 sides somewhat everted at the transverse groove; hinder part 

 triangular with slightly arched sides, the end acuminate or apicu- 

 late, the apiculus nearly always turned to one side, suggesting a 

 connection with the peak of a cyst. Contents yellow-brown or 

 yellow-green; no stigma, the spot indicated, I.e., f. 18, must have 

 been a red oil-drop. It was this species I found in company 

 with cysts (containing the living creature) markedly agreeing 



