BY G. I. PLATFAIK. 133 



A minute spherical form of a pale biscuit colour from the Brisbane water- 

 supply. Such a tint is unusual in this species, all its foiins being' very dark 

 coloured. 



Trachelomoxas armata var. glabra Playf. (PI. vii., fig. 4). 



Forma corpore ovato subgloboso nee oblongo. 



Long. Corp. 32, lat. 26;*. Lismore (365). 



This specimen is the shape of Ehrenberg's type — ovate subglobose, slightly 

 narrower in front than behind, — quite smooth, however, except for the posterior 

 ring of awns. The chloroplasts and cytoplasm were reticulate. 



Var. longispina Playf. 



Long. Corp. 42, lat. 32; spin, poster, long. 17, lat. max. 42(n. Lismore. 



A fine specimen noted alive. The lorica was hispid with fine short spines 

 (2^ long) and was armed behind with a ring of 10 long awns. Previously 

 recorded only from Sydney and with no more than 4 posterior awns. For figure 

 take that of var. duplex (PI. vii., f. 5) without the subapieal ring of awns. 

 This is the first specimen of Tr. armata which agreed with Ehrenberg's type in 

 being "hispid.'' 



Var. DUPLEX Playf. (PI. vii., fig. 5). 



Forma spinis brevibus hispida (nee granulata) ; aculeis anterioribus acutis 

 nee bacillaribus ; aculeis posterioribus longissimis. 



Long. Corp. 45, lat. 35; acul. poster, long. 24/*. Lismore (332, 347, 365). 



Var. duplex is very rare, as yet only found at Lismore. In this form the 

 lorica is hispid with fine short spines, and not granulate. The awns of the 

 anterior series are acute, not bacillar. 



Tkachelomonas lismorensis var. iiirabilis Playf. 



Diam. corp. s. spin. 25—26; spin. long. 5—6fi.. Lismore (260, 261, 351). 



My original description of this form gave only the end view. I can now 

 state that the lorica is globose, differing in this from other forms of the species. 

 Indeed it is doubtful if it should be placed under Tr. lisnwrensifi, as the spines 

 are characteristic, stout, conical, very closely set at equal distances apart and 

 not in rows, 7 — 8 visible in a quadrant of the circumference, the outer half 

 hyaline. (PI. ^-ii., f. 22). 



Var. bisebiata Playf. 



Diam. corp. s.sji. 15; sp. long 3^. Wvrallah (310); Bvron Bav; Lismore 

 (311, 328, 344, 347). 



All the varieties of this species are remarkably regular in size and shape. 

 This form is now confirmed from several localities in the district. 



Tbachelomoxas paucispino.sa. n.sp. (PI. vii.. fig. 6). 



Lorica subglobosa ubique rotundata; eollo nullo; membrana glabra lutea, 

 spinis brevibus validis acutis sparsis armata. 



Long. s. spin. 17*, lat. 16; spin. long. c. 2*;*. Lismore (261). 



A smooth subglobose or very broadly oval form, armed with short, sharp, 

 stout spines, very wide apart — only 5 or 6 are visible at each side. A very 

 rare species. 



