PAPENFUSS: CLASSIFICATION OF THE ALGAE 147 



edge of the Chrysophyceae is still extremely fragmentary and any systematic 

 arrangement adopted at tliis time is unavoidably artificial. Thus, for instance, 

 the orders Chrysomonadales, Isochrysidales, Ochromonadales, and Prymne- 

 siales- are based largely on the possession by the component forms of one, two 

 equal, two unequal, or one short and two long flagella, respectively, whereas dif- 

 ferences in flagellation are not considered a valid criterion for the segregation 

 into separate orders in the Chrysocapsales (in which the motile stages of some 

 genera possess one and of others two flagella of equal or unequal length), Chry- 

 sosphaerales (some contain one and some two flagella of imequal length), and 

 Chrysotrichales (some with one and some with two flagella of unequal length). 



Class Chrysophyceae (Pascher) Fritsch, in West (1927, p. 22) 

 Syn.: Chrysophyceae Pascher (1914, p. 143, as "Reihe") 

 Subclass CIIRYSOPHYCIDAE Papenfuss, nom. nov. 

 Syn.: Chrysomonadineae Senn (1900, pp. iv, 152) 

 Order CHRYSOMONADALES Engler (1898, p. 8) 



Family Chrysomonadaceae Stein orth. mut. De Toni (1895, p. 598) 



Syn.: Chromulinaceae Engler (1897, p. 570); Chrysapsidaceae Pascher 

 (1910, p. 11); Euchromulinaceae Pascher (1910, p. 15); Chromo- 

 phytonaceae Hansgirg orth. mut. De Toni (1895, p. 599) 

 Family Oicomonadaceae Senn (1900, p. 118) 



Cf. Scherffel (1911, p. 329) ; Pascher (1912a, p. 190) 

 Family Mallomonadaceae Pascher (1910, p. 31) 

 Family Pedinellaceae Pascher (1910, p. 8) 

 Syn.: Cyrtophoraceae Pascher (1911a, p. 122) 



Order ISOCHRYSIDALES Pascher (1910, p. 36) 



Syn.: Hymenomonadales Fritsch, in West (1927, p. 315) 

 Suborder Isochrysidineae G. M. Smith (1933, pp. 170, 174) 

 Family Isochrysidaceae Pascher (1910, p. 36) 



Syn.: Syncryptaceae G. M. Smith (1933, p. 174) 

 Family Synuraceae G. M. Smith (1933, p. 175) 

 Suborder CoccoUthophorineae Papenfuss, nom. nov.' 



Syn.: Coccolithineae (Lohmann) Kamptner (1928, p. 23); Family Cocco- 

 lithophoridae Lohmann (1902, p. 127); Class Coccosphaerales Lemmer- 

 mann (1908, p. 24); Class Coccolithophorales Lemmermann (1908, p. 

 33); Order Coccosphaerales Haeckel (1894, p. 110) 



Family Syracosphaeraceae (Lohmann) Lemmermann (1908, p. 35) 



Syn.: Pontosphaeraceae Lemmermann (1908, p. 33) 

 Family Halopappaceae Kamptner (1928, p. 24) 

 Family Deutschlandiaceae Kamptner (1928, p. 27) 

 Family Hymenomonadaceae Senn (1900, p. 159) 



Syn.: Euhymenomonadaceae Pascher (1910, p. 41); Thoracosphaera- 

 ceae (Kamptner) Schiller (1930, p. 156) 

 Family Coccolithophoraceae (Lohmann) Lemmermann (1908, p. 38) 

 Syn.: Coccosphaeraceae G. Murray et Blackman (1898, p. 439) ; Rhabdo- 

 sphaeraceae Lemmermann (1908, p. 39); Coccolithaceae Kamptner 

 (1928, p. 25) 

 Order OCHROMONADALES Pascher (1910, p. 47) 



Family Monadaceae Stein orth. mut. Engler (1898, p. 7) 



Syn.: Ochromonadaceae Senn (1900, p. 163); Dendromonadaceae Stein 



2. Pascher (1929a, p. 271, footnote) is inclined to think that a second short flagellum 

 may have been overlooked in Prymnesium (cf., however. Carter, 1937, pp. 40-43). The 

 only other genera in the order, Platychrysis and Chrysochromulina, contain one short and 

 two long flagella, according to Carter (1937) and Lackey (1939), respectively. 



3. The classification of this suborder is based on the systems of Kamptner (1928) 

 and Schiller (1930). 



