209 



scncm (Iiiplicem altcrnanlihas. — Meyen* I. c. n. 4. f. 31. 

 (non f. 30.) (1828). — S. octalternns ct qiiadraU'ernas 

 Ktz, 1. c, p. 81 et 80. n. 13, 12. f. 95 (pro errore 93) 

 et 94, — Acbnanthes. quad ralterna et ocioalterua Tnrp, 

 Diet. I. c. f. 8 et 12^, Mem. I. c. f. 7 et 8. — Arlhrodes- 

 mns aculos Ehr, I. c. (pro parte qsoad sTnon.) 



(V. T.) 



10. Scenedesmus parvnlus Mgh*, ccllalis miulmts, ellipti- 

 ds, extrorsom lunnlatis, apice rotnndalis, binatim concre-* 

 lis. — Menegh.^ K c- p. 17- (1837.) 



(V. y.) 



i 



Species nomine tantum mihi notae, 



11. ? Scenedesmus tetradacrys Breh^ Alg. Fal, p. 66. (1835.) 



/?, duplejp Br(?b. in litU — S, octodacrjs ejiisd. Alg. 

 Fal. p. 66. ^ 



w 



12.? Scenedesmus ovaUernns Brdb^ I. c. p. 66. (1835.) 



ly, Pediastrutrh Meye^^ Celluiae planae, an^losae, 

 la orbem radiatom disposit^e,, mcitfbranula communi byalina 

 iiisidentcs. 



Forma ceiliilariiin, earnmr|iie nnraenis et di^tributio cha- 

 ratteres suppeditant ad species Juijusce generis sistendas. 

 Nisi Tcro his, omiiilins character! bus attendamus facillime in 

 frrorem inicidere possumas noras condendo species mox aptio- 

 ribns observationibns deleodas. Binas species^ Borjanum et 

 hexaetis, din in cnbicnlo coliii evolotionennjue item ac cl. 

 lHhrren in P. qiiadrato, in illis seqnntns som^ ex qoiibns 

 tandem in earn cnm el. Meyen addneor sententiam, charactc- 

 T^ e numero ccllnlarnm sumptos, qnibus ^^Ehrenherg con* 

 fidenter et exclusive nititnr, ad species distiognendas minoris 

 esse moment!. In hoc tamen cum eodem convenire neqneo^ 

 fonoas itidem cellnlarnm omnino spcrnendas esse, eas cnim 

 rarias et ipse in iisdem speciebas pro numero et distributione 



