232 P. F. BEIKSCH ON rRESHWATEE ALG^ 



immediately evident spontaneous movement. AverrJioa appears to 

 be without motion during sleep ; but Desmodium even tlien con- 

 tinues gyration. 



This observation on the Blimbing has yet to be worked out, and 

 is brought before the Society because the present [date of reading] 

 is the last meeting for the season. The special movement was 

 observed but a few days ago. It is probable that allied plants 

 have something to show ; and Averrhoa itself requires considerable 

 time from the slow repetition of its movements, influenced as 

 they are also by light, temperature, &c. 



Contributiones ad floram Algarum aquae dulcis Promontorii Bonae 

 Spei. By Paul Peedebic Eeinsch. (Communicated by Dr. 

 Hooker, Pres. E.S., F.L.S.) 



[Eead April 19, 1877.] 

 (Plate VI.) 



Cum speciminibus in Insula Kerguelensi selectis accepi speci- 

 mina Algarum aqua? dulcis in Promontorio Bonse Spei autumno 

 1874 a cl. A. Eaton collecta. Quae specimina consistebant in 

 octo numeris speciminum in charta siccatorum et sex ampullulis 

 vitreis cum speciminibus in spiritu vini asservatis. Numerus totus 

 (sine Diatomophyeeis) specierum a me inventarum in his ad in- 

 quirendum traditis speciminibus est 57 ; ab his sunt 16 Phyco- 

 chromophycese et 41 Chlorophyllophycese. Secundum ordinem 

 systematis adducta scrutationis summa est hsec : — 



PhycocTiromopJiycecd, 



Chroococcacese Spec. 5, gen. 3. 



Oscillariacese Spec. 4, gen. 4 (sp. n. 1). 



Nostochacese Spec. 1 (sp. n.). 



Scytonemaceae Spec. 1. 



Sirosiphoniacese Spec. 5, gen. 1. 



EivulariacesB , Nulla, 



Ch loroj^TiyllophycecB, 



Palmellaceae Spec. 3, gen. 3 (sp. n. 2). 



Protococcacese Spec, 8, gen. 6 (sp. n. 4). 



Desmidiese Spec, lo, gen. 5 (sp. n. 4), 



ZygnemacesB Spec. 2, gen. 2 (sp. n. 1). 



Confervacese Spec. 2, gen, 2, 



Chsetophoracea? Spec. 2, gen. 2 (sp. n. 1). 



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