424 



Algae. 



Indian Government, has used his leisure time to collect plankton 



in the sea and to examine the samples under the microscope 



Having no literature and knowledge concerning the Identification of 



the organisms met with, he made very good and careful drawings 



of all the forms he could distinguish. These drawings and a sample 



of matenal made by preserving parts of many net-towings in one 



bottle, were placed at the disposal of the author. 



.u ?f°"^ ^^^ examination it becomes evident that the plankton of 



the Boeton Strait (Lat. 5° 30' S.. Long. 122° 30' E.) is a rieh 



nentic tropical plankton, resembling much the plankton of the 



Malay Archipelago as known from Cleve's researches, and 



that Ol the Gulf of Siara (the author's research). In spite of th- 



msufficient matenal (many drawings oi Rhisosolenia, Coscinodisacs 



^nö. Chaetoceras were not identificable) the list encompasses 101 



species of protoph3^tes: 



New species and combinations are: Dinophysis miles Cleve 

 subsp. Schweteri (Forti) and subsp. Maris-riihvi (Ostf. & Scbm.); D. 

 pedimciilata (Schmidt); Peridinium assymmetriciim (Mangin); P. Man- 

 gtnii {— Diplopsalis niinhna Mangin, non P. minimum Schill)- P 

 saecularis (Murr. & Whitt); Coscmodiscus Castracanei (= C. centralis 

 var. Castracane)\ C. Jonesianus (Grev.). The C. biconicus van Bree- 

 men is identical with C. commutatus Grün. Author's abstract 



Ostenfeld, C. H., OmAlgeslaegten Halosphaera's systema- 

 tiske Stilling (On the systematical place of the Algae 

 gen US Halosphaera). (Bot. Tidskr. 34. II. 3. p. 70. Kebenhavn. 

 June 1915.) 



In March 1914 the author observed, in the tropical Atlantic, a 

 cell of Halosphaera the contents of which were formed into zoospo- 

 res of an amoeboid or better a metabolic character. They were pale 

 j^ellowish-green with a transparent apex behind which a carmin 

 eye-spot was found; no flagella were seen. 



The author proposes to place Halosphaera in the Heterokontae 

 (m the neighbourhood of Botrydiopsis and Botrydium) for the fol- 

 lowing reasons: 1. the numerous small yellowish-green chromato- 

 phores; 2. oil (not starch) as result of the assimilation; 3. the cell 

 wall being built up of two layers; 4. the Constitution of the cell 

 wall being of pectines and siliceous matters; 5. the power of the 

 zoospores to alter their shape. Still we want a deciding research of 

 the character of the flagella of the zoospores, Schmidtz's old in- 

 vestigations being not quite reliable. C. H. Ostenfeld. 



Pascher, A., Zur Gliederung der Hetero kon ten. (Hedwiffia. 

 LIII. p. 6—22. 8 Textfig. 1913.) 



Verf. gelangt zu folgender Uebersicht der Chlorophyceen: Poly- 

 hlepharidinae , Volvocales, Tetrasporales, Protococcales, Ulotrichales, 

 Siphonales, Siphonocladiales, wobei es sich um Zusammenfassungen 

 gleich hoher Entwicklungstypen handelt, die bei den Chlorophyceen 

 wohl auf allerdings morphologisch einheitlich charakterisierbare 

 Flagellateniy^en zurückgehen. 



Die Heterokonten muss man als Ganzes betrachten. Die Be- 

 trachtungen des Verf. betreffen die Morphologie. Phylogenie und 

 Verwandtschaftsverhältnisse der einzelnen Reihen mit steten Hin- 



