5-iO SUMMARY' OF CURRENT RESEARCHES RELATING TO' 



of movement increases with the temperature, but more quickly at first 

 than afterwards. Hence it is not a mere question of physics — namely, 

 an increased rapidity of algal movement proportional to the diminishing^ 

 viscosity of the water. The increased activity is much more a physical 

 than H physiological phenomenon, save at extreme temperatures wliere 

 the variation of viscosity does not suffice to explain the rapid increase 

 of activity. 



FlagellatsB with Lateral Cilia.* — A. Pascher describes the lateral 

 cilia borne by three of the FlagellattB — NephroseJmis olivacea Stein,. 

 Protockrysis 'plideopliycearam Pascher, Sennia coinmutata Pascher. The 

 two former are true Cryptomonads ; Sennia is uncertain. 



Rhizopod and Palmella Stages of Flagellatae.t — A. Pascher writes 

 on the Rhizopod and Palmella stages of Flagellatte (Chrysomouads). He 

 shows that in Synura vvella the cell-contents may issue in the form of 

 an amoeba. The swarm-spores may also be converted into similar 

 amoebae. Under certain circumstances the amoeboid stages form rhizo- 

 pods, and closely resemble certain already known Chrysomouads. A 

 Palmella stage may arise from the swarm-spores and from the Rhizopod 

 stage ; and the individuals that swarm from the Palmella develop into 

 Synura again. Rhizopodial forms are commoner in the Chrysomonads 

 than had been supposed ; and Palmella stages are at least facultatively 

 very common. The author proposes to give the name pf Rhizochryso- 

 dinege to all Chrysomonads known only in the Rhizopod stage ; and 

 for those Chiysomonads in which a motile condition occurs only for 

 purposes of propagation, he proposes the name Chryso-capsules. He 

 gives a synopsis of the brown Flagellatge, dividing them into two series 

 — -Chrysomonadea^ and the PhiBOchrysidalese (Cryptomonads). The 

 Chrysomouadeae he divides according to the character of the cilia into 

 Chromulinales, Isoclirysidales, and Ochromonadales. 



Gymnodinium.l — G. Entz describes a Gymnodinium found at Buda- 

 pest, and nearly allied to G. Zachariasi. He gives details of the size^ 

 processes, chromatophores, and nucleus. The text is in Magyar, with a 

 (lerman resume. 



Diplopsalis lenticula.§ — J. Pavillard writes on Diplopsalis lenticula 

 Bergh. which he has collected several times in May and June in the 

 Lake of Thau and in the Mediterranean. He describes it in detail, and 

 points out that many authors have attributed to D. lejiticula totally • 

 different species, one of which has been separated off as Feridiniopsis- 

 asymetrica Mangin. The specimens described by Meunier in his Micro- 

 plankton des Mers de Barents et de Kara may possibly be a variety of 

 D. sphserica. D. sphaerica is identical with Peridinium Paulseni Mangin,. 

 but owing to complications of priority that species must now be known, 



* Zeitschr. wiss. ZooL, C. 2 (1912) pp. 177-89 (figs.) 



t Arch. Protistenkunde, xxv. (1912) pp. 153-200 (9 pis. and figs.). 



i Allat. Kozlem6nyek, Budapest, ix. (1910) pp. 157-63 (1 pi. and figs.). 



§ Gomptes Rendus, civ. (1912) pp. 175-7 (figs.). 



