324 FRESHWATER ALG^ OF LISMORE DISTRICT^ 



from Cos. red var. africatuim W. & G. S. West, Alg. Ceiitr. Afr., 

 p. 377, P1.361, f.l4, in having the upper part ot the sides retuse. 

 Var. hiretum and its forms are all closely connected with var. 

 Boldtii. f. minor, supra, indeed are merely modifications of it; 

 and their association, in the same gathering with the mixed form 

 of var. nodulatum and var. Boldtii f. minor, shows quite plainly 

 how smaller forms, with new characteristics, are produced from 

 a very different type by repeated self-division. 

 Cos. RECT. var. quadrigeminatum f. latior, n.f. (PI. xli., f.l5.) 



Forma paullo minor. Semicellulse quam f. typica pauUo 

 latiores; apicibus nodulis 4 (fronte cernendis 2) aut infra mar- 

 ginem, aut protrusis, instructis; a latere globosse apicibus nodulis 

 2 (cernendis) ornatse. 



Long. 36, lat. 28, basis 23, ap. 12, isth. 9 /x. 



Lismore (185). 



Syn., Cos. red. var. CamJbrense (Turn,) W. & G. S. West, forma, 

 Polym. and Life-hist., p. 476. This form falls better here than 

 under var. Camhrense, as the latter is a form with square semi- 

 cells. 



Cos. RECT. var. anqustius f. minor, n.f. (Pl.xli , f.l6.) 



Forma dimidio minor. Semicellulae insequaliter hexagonae, 

 parte superiore arcuata angulata; angulis lateribus psene centrali- 

 bus; lateribus baud retusis; apicibus truncatis angustis. Vertice 

 visse ellipticas polls acuminatis. 



Long. 16, lat. 12, basis 10, ap.4, isth. 2/x. 



Lismore (185). 



Cf. Nordstedt, N.Z., PI. vi., f.l5, 16. The figures of Cos. 

 pseudoprotuherans /3 angustius Nord., contain two distinct types. 

 Of these, the lower semicell of f.l5 and the upper semicell of f.l6 

 are identical with Cos. red. var. Finmarkice Playf., Polym. and 

 Life-hist., p.478, PI. xiii., f.l3. The other semicells, with angular 

 apices, I have arranged as Cos. red. var. angustiiis (Nord.), I.e., 

 p. 477.* The latter is certainly a form of Cos. redangulare. The 



* The note at the top of p.478 — " this really goes under var. repandiim. 



Its sides are not so sloping as in var. FinmarkicB " — is evidently 



erroneous. I must have had some other form in mind. Var. angustius is 

 quite close to var. FinmarkicR. 



