546 Protococcoidea3, Volvocace^e, rteromonas. 



Propagatio zoogonidiis 2-1-8-lG intra cellulani vegotativam or- 

 tis, membrana valvatim secedente libere examinantibus ; zygota 

 numquam observata. 



Propagatio etiam (autumuo tempore) cystis membrana brunnea 

 donatis, plasmate flavescenti foetis, germinando cellulas 4-8 effi- 

 cientibus. 



I. Phacotus lenticularis (Ehrenb.) Stein 1. c, Dang. 1. c, Crijptomo- 1307 

 nas leniicularis Ehrenb., Phacolns viridis Perty 1. c. — A Ple- 

 romonade angulosa differre videtur plasmate cum membrana cel- 

 lulaj vegetativfe contiguo, valvis (in quas merabrana rumpitur) cilia 

 servantibus. 



Hab. in aquariis passim imprimis in Germania, Gallia, Suecia, 

 — Cl. Carter in hac specie vidisse copulationem scripsit; atta- 

 men, suadente etiam cl. Dangeard, raihi dubia videtur. 



FPTEROMONAS Seligo [18861 Unters. iiber Flagellaten in Cohn Beitr. 

 Biol. Pflanzen IV. Baud, II. Heft, p. 115, tab. VIII (Etym. pteron 

 ala et monas), Cfr. Just Botan. Jahresb. 1886, p. 340-341, Pha- 

 cotus Stein ex parte. — Cellulae tegumento amplo, explanato-cora- 

 presso, e latere raajori rotundato-subcordiforrai, antice forarainibus 

 tenuissimis (ciliis singulatim percursis) instructo prasditae, tegu- 

 mento ipso lateraliter in alas litterse S ad instar incurvas, dein, 

 contentu maxime evoluto ia appendices deorsum sursumque trans- 

 formatas producto; chloropliorura globoso-cavura, peripheriara fere 

 totam occupans, pyrenoidem majusculum fovens; vacuola contra- 

 ctilia minuta; cilia 2, corpori circiter sesqiiilongiora; nucleus 

 haud visus ; granula amylacea sparsa; stigraa haud extans. 



Multiplicatio ut in genere Phacoto. 



Obs. Genus quod ad locura dubium, fortasse (observante clavus 

 Hansgirg in Notarisia IV, p. 058) Crijptoglena:eis inter algas phy- 

 cochromaceas adscribendum. 



1. Pteromonas alata Colm in Soligo I. c t. VIII, f. 42-45, Phaco- \m 

 ius angulosus (Cart.) Stein Infus. p. 1 12, Dang. Rech. sur les 

 Algnes inf6r. in Ann. Scienc. Nat. 1838, p. 120, t. XI, f. 22-33, 

 Cryptoglena angulosa Carter in Ann. Nat. Ilist. 1850, pag. 18, 

 t. I, f. 18, a-c — Characteres genoris; massa plasmatica 12-11 

 2 8-9; tegumento 18-23^:15-20. 



Jfah. in aquis stagnantibus ad u Hohenraolsen » Tliui-ingiai (A. 



