BY G. I. PLATFAIR. 529 



Cells drop-shaped, rounded above, pointed below, and drawn 

 out into a slightly curved hyaline beak, which merges into a long 

 thin hyaline stalk as in Ch. lougipps: Membrane thin, chloro- 

 plasts sometimes containing a pyrenoid. Noted from two spots 

 at Lismore, singly, or several in a clump, on filamentous algie. 



Characium cerassiforme v. minimum, n.var. 



Cellular minutne, supra rotundatse nee deplanata?; petioloparvo 

 aut nullo; magnitudine formae typicfe triens. 



Long. 1418, lat. 10/x. Lismore. 



Cf. Ch. ceraHdformp. Eich. cfe Racib., Nowe gat. zielenic, p.l, 

 T. iii., f.l2; also Ch. pyrifurmp A. Braun, Alg. unicell., p.40, 

 T. v.B. About one-third the size of the type, and not flattened 

 above. Ch. cera-^si/nrme is more globose in tlie bod}^ of the cell 

 than Ch. lyyviformp. On Trihoripma; (Text-fig. G/), (■). 



(•HARACIUM ORNITHOCEPHALUM A.Br. (Text fig. 6^). 



Long. Corp. 23, lat. 74; petiol. long. l^jx. Lismore. 



Fani. HYDROGASTRACE.E. 

 Genus U r x e l l a, gen.nov. 

 Character idem ac speeiei. 



Urnella terrestris, sp.unica. (Text-fig. ?«-<:•). 



Cellulse primum clavatse, deinde dehiscione anguste-urniformes; 

 lateribus subparallelis; ore everso; basi rotundata ; aut humo 

 sedentes aut tubulo insequali longo erectae. Membrana tenuis, 

 hyalina. Chloroplastis parieialis in extrema cellula contracta : 

 pj^-enoidibus plurimis. 



Corp. urniform. long. 00-90, lat. 12-20; tubul. lojig. ad 150, lat. 

 7-8/ji. Auburn. 



Noted in a green growth on a garden-path (clay) in verv wet 

 weather. The important part of the plant seems to be the long 

 clavate cell which, at dehiscence, becomes a slender urn-shape, 

 rounded below, with sides almost parallel, and the rim everted. 

 This cell is sometimes seated on the ground, sometimes erected 

 at the end of a fairly long irregular tubule of which it really 

 forms the infiated head. Membrane thin and hyaline, the chlo- 



40 



