340 FRESHWATER ALG^ OF LISMORE DISTRICT^ 



characteristic of V. Bernardii, it is evident that the latter must 

 be identical with V. tertius Meyer. 



While there is no doubt that, biologically, V. aureus and V. 

 tertius belong to the same species, since their zygotes are identical 

 {vide infra), the latter seems to be a distinct permanent variety, 

 and worth keeping separate (as a conventional species) for that 

 reason, and also on account, of the forms connected with it. Jn 

 Europe, it would appear that V. aureus is common, while V. 

 tertius is hardly known. Neither Chodat in Alg. vertes de la 

 Suisse, 1902, nor G. S. West, Br. Frw. Algi«, 1904, mention the 

 latter, nor have I seen any reference to it. On the other hand, 

 in this country, to judge at any rate from the Richmond River 

 district, V. aureus is very rare (I have only one record of it), 

 while V. tertius is common and widespread. It is probably a 

 permanent tropical and subtropical variety. 



Coen. sphser. diam. 214, 220, 300, 320, 325, 360, 450, 500, 635, 

 700, 800, 950; membr. crass. 2-8, vulgo 2-3 /a; cell. diam. 5-8, ple- 

 rumque 8, inter se distant. 5-20 /x. Coen. filial, sphair. diam. 

 ad 250, rarius oval. long. 123-247, lat. 105-180 //, iiumero 2-10 

 plerumque 6-8; cell. diam. 4/x. Oosporje (usque ad 17) diam. 30 /x. 

 Lismore (223, 241, 249, 259, 260, 261), Wyrallah, Kyogle. 



Var. ovALis, n.var. (PL xliv., f.4.) 

 Ccenobium ovale vel oblongum, paullo minus; coenobiis filialibus 

 paucis; plerumque ovalibus vel oblongis. 



Ceen. long. 114-475, lat. 101-425; coen. membr. crass. 2-4 /x; 

 cell. diam. 4-8 plerumque 6/x. Coen. filial, long. 86-114/x(numero 

 1-5). Oosporse (numero 9-20) diam. 42-55, membr. crass. 3-4 /x. 

 Androgonidia immatur. diam. 10-15, matur. diam. 20-22. An- 

 theroz. long. 8-10, lat. 2-21 /x. 



Woodburn (227), Lismore (241, 259). 



A very rich gathering of this form was brought me by Mr. 

 Dan Jolly from a lagoon at Woodburn. On examining the 

 ccenobia in the living state with the aid of a Coddiugton lens, it 

 was noticeable that, in a large majority of cases, the specimens 

 were smaller than usual and quite distinctly oval or oblong, as 

 also were the daughter ccenobia. The number of the latter also in 

 the mother-conobium was less, 2-3 were common, 4 were frequent, 



