840 AUSTRALIAN PRESHWATKR PLANKTON, 



O. APICULATA var. MAJOR Playf.* (PI. Iviii., f.5). 



Cellulse ellipticje, duplo inajores qiiam in f. typica, apicibus 

 minute apiculatis. 



Cell. long. 38, lat. 20//. 



Lismore (286). 



There are two forms of the type, an oblong and an elliptic. 

 This is a larger form of the latter, as var. ><plendida is of the 

 former. Cf. these Proceedings, PI. viii., f.2; the figure there is 

 not sufficiently elliptic, too oblong. This form is liable to be 

 mistaken for 0. salitai-ia; there is no anterior, apical incrassa- 

 tion, however, and an apiculus is present, though very small and 

 inconspicuous. 



Yar. SPLENDIDA Playf. 



Cell. long. 33-41, lat. 21-26/x. Lismore (285, 286). 



"Ooc. and Ui-emo.", p.l31, PI. viii., f.23. These figures extend 

 the dimensions considerably. Var. splendida is a larger (about 

 twice the size) and somewhat more elongate form of var. ohesa. 

 The two forms run into one another however. 



Genus Nephrocytium Nag. 

 N. Agardhianum var. ma.tus Nag. (PI. Iviii., f.6). 



Ccenob. long. 75-78, lat. 50-55; cell. long. 37, lat. 21/x. 



Guildford (23). 



Syn., N. Ndyelli Grun.; N. obesnm West, New Brit. Frw. Alg., 

 p. 13, PL ii., f.39, 40. Cf. Nageli, Gatt. einz. Alg., T. iii.c, fig. 

 i, k, p. Nageli's fig.p works out at 34 x 15/x for the cells; West, 

 I.e., gives "long. cell. 34-42, lat. cell. 24-28/x" for JV. obestim. 

 Except in the slightly greater breadth of the cells, West's figures 

 agree exactly with those of Nageli. 



Var. PLANKTONICUM, n.var. (PI. Iviii., f.7, 8). 

 Ccenobium splijericum inucosum. Cellulse lunata? 4-8 (ple- 

 rumque 4) cunctse, per extremitates (ut videtur) conjunct* ^■el 

 radiantes, ad apices angustatse, apicibus obtusis. 



* This form was mentioned in ''''Oocystis and Eremosphera," p. 110, but 

 the description and notes were inadvertently omitted. 



