BY G. I. PLAYFAIR. 799 



An oblong or broadly oval form with hemispherical ends and 

 almost central transverse groove, the latter somewhat spirally 

 disposed. Our form agrees very well with Stein's figures 

 (Naturg. d. Flagell. i.) but is half as large again according 

 to the dimensions (long. 20-23 /x) given by Schilling, I.e. 



Var. circulatum, n.var. (Text- figs. la ; 3 d.) 



Forma paene exacte circulata, fossa transversa mediana, chro- 

 matophoris luteo-f uscis . 



Long.=lat.=31-35 p. Auburn (140) ; Canley Vale (94) ; Lis- 

 more . 



In dorsal view almost exactly circular, the length equal to the 

 breadth; transverse groove central, on the ventral side very 

 slightly spiral. Chromatophores yellow-brown; in the type they 

 are given as yellow-green, but these two are entirely interchange- 

 able not only in the Peridineae but in other flagellates also. 



Glenodiniuji australicuit, n.sp. (Text-fig. 4). 



Glenodinium magnum, latissime ovale pasne globosum, fossa 

 transversa distincta minime spirali in partes duas maxime in- 

 ;p(|iiales divisum; parte superiore alte-crateriformi, late-rotun- 

 data; parte posteriore arcuata, seutelliformi, parte superiore 

 paullo angustiore; fossa longitudinali distincta. A vertice visum 

 modo compressum, subrenif orme . Membrana glabra. 



Long. 40-45, lat, 36-40, crass. 28 M . Botany (152) . 



A very broadly oval almost globose form, divided into two 

 very unequal parts by a distinct though shallow transverse fur- 

 row which is very slightly, if at all, spiral. The upper and 

 larger part is deeply bowl-shaped with broadly rounded end; 

 the hinder portion arched and saucer-shaped. The longitudinal 

 furrow is quite distinct. In end view the cell is slightly com- 

 pressed, subrenif orm. Membrane smooth. This species re- 

 minds one of Gl. neglectum Schilling, and still more of Gl. uligi- 

 nosum Schilling, op. cit., pp. 24, 25, figs. 25, 28. Gl. australicum 

 however is broader and more globose than either, more rounded 

 than the former, and with the upper part less deeply bowl- 

 shaped than in the latter. The transverse furrow also is much 

 more shallow than in either of Schilling's species. 



Genus Peridinium Ehr . 



Peridinium caudatum mihi. (Text-fig. 5 g) . 



Peridinium minutum, ovatum, angulatum, fossa transversa fere 

 circulata divisum; membrana glabra. Epivalva subtriangulari- 



