BY G. I. PLAYPAIR 143 



Plankt. Schwed. Gewass., p. 107; in O. Borge, Bot. Notiser, 1900, 

 T. i., f.3. It is impossible to iiiidei'stand why this form has been 

 placed under 0. gigoK, which is a very large form, and broadly 

 oval or oblong. Tlie cylindrical is one of the regular type-forms 

 of 0. Ndgdii, and Lemmermann himself, Lc, classifies it with 

 that species. I have not seen the figure. 



0. pelayica Lemni. = 0. Nagdii K.^v. — "Zellen zu 4-8 von der 

 weiten, gallertartigen Mutterzellhaut umschlossen, elliptisch, mit 

 zahlreichen wandstandigen Chromatophoren, ohne Pyrenoide, 1 2/i. 

 lang und 7/i, breit, Hiille 66:77/>i." Lemmermann, Nord. Plankt., 

 xxi., p. 16, f.56. The author himself classes this with 0. Niigelii; 

 and the very large mother-cell, on whicli he relies, is of no value 

 as a specific characteristic. 



0. sjiec, Schmidle = 0. Nordstedtiana (De Toni) mihi. — "Zellen 

 stets einzeln, beiderseits mit je einem Tuberkel, breit elliptisch, 

 40/x lang, 32 breit." 8chmidle, Alg. aus d. Nyassasee, p.79. 



0. Ndgelii ft Novcp. Setnlice = 0. Novce SemlUe Wille. 



0. ci'assa y nodulosa (West) Chodat = 0. twdulosa W. West. 



Oocystella nalans Lemm. = 0. lacustris var. naia7is(Lemm.)mihi. 



0. gloeocystiformis Borge =0. apiculata W. West. — "Cellulae 

 ellipsoidese in utroque fine tuberculo parvo instructse, 2-mult£e in 

 familias tegumento generali crasso ut in Gloeocystide involutas 

 congests; contentus guttulas 2 oleosas fovens.'' Borge, Siissw. 

 Clilor. V. Feuerland, p. 25, T. ii., f.l. 



0. Niigelii v. m'uiutissiuia Bernard = 0. JVovce Semlice Wille. 



0. elliptica var. Africana G. 8. West = (9. Ndgelii v. Africana 

 (G. S. West) mihi. 



Genus Eremosph;era De Bary. 

 Syn., Chlorosphcera Henfrey, 1859, spc. G. 8. West, Brit. Frw. 

 Algse, p.229. 



Eremosph^.ra viridis De Bary. (PI. ix., f.l, 2). 



Cell, matric. diam. 104, 118, 230, 250, 280, 285, 290, 306, 330/x. 

 Cell. veg. vel autosp. diam. 42, 44, 46, 48, 50, 60, 65, 70, 74, 76, 

 78, 80, 86, 90, 94, 95, 100, 105, 110, 133/^. Membr. crass. 1-4 /x. 

 Corp. centr. diam. ca. 16ju. 



