848 AUSTRALIAN FRESfiWATER fLANKTON, 



strongly expanded bases, so broad, indeed, as sometimes to 

 enclose tlie whole cell. The processes are akin to those of Stanr- 

 astrum or the horns of Pediastrum. Indeed, the fully developed 

 plant resembles nothing so much as a four-celled Pedi. simplex. 

 Bernard gives, cells 5-10/a, spines l3-20/x, for Javanese specimens. 



Var. CRUCiATA, n.var. (PI. lix., f.5, 6). 



Cellulai in vicem spinulorum processubus longis gracillimis 4 

 (p(jlaril)us 2, equatoiialibus 2) basi valde expansis, instructse; 

 inembrana snepe dilute rufescente. 



Cell. diam. 6-12, process, long. 18-27/i. 



Parramatta Park (136). 



In this, apparently the mature, form, the spines are replaced 

 by long, slender processes, greatly expanded at the base; see 

 notes on the type, siipra. 



Bernardia Wratislavensis (Schrod.) mihi. (PI. lix., f.7). 



Cell. long. 8, lat. 3; spin. long. 16/ji, 



Lismore(258). 



Syn., Lagerheimia Wratislavensis Schroder, Ber. d. deutsch. 

 bot. Gesellsch., xv., T.17, f.7: Chodat, Alg. vertes, p. 188, f.l03. 

 This form has spines arranged as in Bei n. Chodati, and should 

 accompany that species. The spines and processes, also, in this 

 genus are more or less rufescent, which I have never noted in 

 the setas of Lagerheimia. 



DICTYOSPHtERIEtE. 



Genus Tetracoccus West. 



Tetracoccus botryoides West. (PL Hx., f.8, 9). 

 Cell, diara. 3-8/x. Lismore (285). 



PALMELLACE^. 



Genus SPHiEROCYSTis Chod. 



SPHiEROCYSTIS ScHROETERI Chod. (PL lix., f.lO). 



Coenob. diam. 28-300; cell. diam. 3-1 2/x. 



Botany ; Sydney Water (80, 81); Lismore (260, 281, 286) ; 

 Grafton, Nymboidia River (268). 



