526 PLANKTON OF THE SYDNEY WATEU-SUPPLY, 



Subfam. D E s M i u i A c k iE. 

 Genus Docidium llalfs. 



Doc. TRABECULA var. DeLPONTEI f. CONSTRICTA Playf., rt/i^ert 1 910. 



(Pl.liv.,f.l). 



Forma apicibus perfecte i-ectangularibus, minute granulatis; 

 granulis circ. 12 (visis 7). Suture prosiliente. 



Long. 600-694; lat. bas. intl. 30-34; constr. 26-28; centr. 28-32; 

 ap. 21-23 [M. 



The apex in these specimens was sharply rectangular. This 

 was due to the presence of about twelve minute granules at the 

 extreme tip, wliicli were just large enough to square off the other- 

 wise rounded angles. This makes the sixth form of apex noted 

 for D. trabecida var. Delpoittei. 



Genus SpiROTiENiA Breb. 



8piko. minui'A Thuret. (PI. liv., f.2). 



Long. 18; lat. 4-5 /a. 



Frequent in the filter-samples in April, not observed again. 



Spiko. bispiralis var. fusifokmis, n.var, (PI. liv., f.3). 



Forma minor, cellulis fusiformibus; apicibus brevissime ex- 

 pansis, truncatis, incrassatis. Endochroma in taenias 2 decussatim 

 ordinata, tteniis circuitus 2-3 efficientibus. 



Long. cell. 53; lat. 8 /x. 



Genus GoNAToZYGoN De P>y. 



GoN. KiNAHANi (Arch.) Kab. 

 Long. 155-630; lat. 1 1-1 4 //,. 



Var. MONOTiENiUM(De By.) milii,(Syn. G. Ralfsii De By.). 

 Long. 82-206; lat. 7-8 /a. 



Var. KjKLLMANNl( Wille) inihi,(Syn. G. KjeUvianui Wille). 



Long. 101-148; lat. 12//. 



Fifteen cells forming a single chain. Tt is a form of Gun. 

 Kinahani var. Ralfsii in which the cells have been greatly 

 shortened by repeated division. (PI. liv., f.4). 



