BY G. I. PLAYFAIR. 473 



Var. OVATUM, u.var. (Pl.xi., f.6). 



Foi'ma Doc. ovato Nord. consimilis; semicellulis e sutura valde 

 inflatis; lateribus ad apices rapide convergentibus; apicibus tiun- 

 catis. Forma var. Delpontei e divisione producta. Long. semi. 

 95; lat. max.44; ap.21|Li. 



Coogee(slide 1a). 



Var. lNPicuM(Grun.), non Turner, Frw. Alg. E. Ind, T.iv., f.8. 



Long.624-790; lat. bas.28-36; centr 24-33; ap.22-24/ii. 



Sydney water-8upply(80, 81). 



A plankton form of var. Ehrenbergli, or one caused by serai- 

 plankton-conditions (a strong current of water). I have never 

 met with it except in the )Sydney water-supply. 



Var. BACULOiDEs(Roy &l Bisset), forma. 



Forma bievior, inflatione basali unica tantum. Endochroma 

 in tsenias parietales 3-4 ordinata. Long.200-276; lat, bas. 15-18- 

 ■centr.14-15; ap.lO-12yx. 



Botany(109A). Cum formis sequentibus duabus. 



The semicells were the sliape of Pl.xii., f.3rt, but without the 

 basal plicte. 



Var. BACULUM(Breb. ) (Z)oc. bacnlnni). (Pl.xii., f.2, 3). 



Long.178-254; lat.bas. 12-15; constr 9-10; centr. 13-15; ap.8-10/x. 



Botany(109A). Cum priori. 



Endochroma in lamina unica sed parietali disposita. Pyrenoi. 

 dibus nullis. Jn an empty semicell, the base of which was tilted, 

 the basal granules were plainly to be seen. They were 16 in 

 number, each with a plication ascending half-way up the basal 

 iiiflation. It is noteworthy that there is the same number of 

 plicae in Doc. inaaubrium, Frw. Alg. INIadag., p.^4. 

 Forma major, n.f. (Pl.xii., Lib/. 



Forma granulis basalibus nullis vel inconspicuis; semicellulis 



perfecte cylindraceis, supra isthmum valde inflatis et sursum 



. interdum levissime constrictis; apicibus aut rectis truncatisque 



