330 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Marine Flagellatse in Fresh-water.* — A. Pascher records the 

 finding of Pliacomonas peJagica in a fresh-water pond near Hirschberg, 

 in Bohemia, a flagellate hitherto recorded as occurring only in salt- 

 water. Two other organisms, found with it, resembled very closely 

 certain other marine flagellates — Calycomoiias gracilis and Chrysococcus 

 doJcidophorus. In a postscript Pascher states that Galycomonas is a 

 rhizopod. 



Nannoplankton.| — A. Pascher writes on the nannoplankton of fresh- 

 water, that is minute organisms recently obtained from fresh- and salt- 

 water by means of the filtering apparatus of Appendicularia and by the 

 centrifugalization of minute quantities of water. He describes two 

 special forms — Chrysapsis agilis and a probable ChromuUna. Also he 

 records as occurring in a tank in the Prag Botanic Garden a marine 

 organism- — Ghlamydomonas microplankton, wrongly referred by Biittner 

 to Chlorocystis. A morphological peculiarity of all these fresh-water 

 flagellates of nannoplankton is the possession of extraordinarily long 

 cilia. Minute green algal cells also form a constituent of nannoplankton 

 — Chlorohium limicola, etc. 



Chrysomonadinese.l — J. Scherffel publishes a contribution to a 

 knowledge of the Chrysomonadinete, the result of years of observation. 

 The first section of his paper treats of Chrysamoeba and Chromulina 

 nehidosa. In the second he describes the new genus Chrysostephano- 

 sp)haera with one species, G. globidifera. The third treats of the genus 

 Chrysopyxis, which the author regards as a Ghrysamoeba, because it has, 

 not a cilium, but a pseudopodium. In the fourth he describes two new 

 species belonging to a new genus, Lepachromidina, together with Pascher's 

 Chrysopyxis cyathus. In the fifth he describes a very large Chrysomonad 

 which he places temporarily in Chromulina. In the sixth he discusses 

 the resting-cysts of the Chrysomonadinege, drawing special attention to 

 their pore. In the seventh he discusses the red pigment-bodies of the 

 Chrysomonads, which are excretions from the cells ; they occur especially 

 in brown moorland-waters, and have nothing to do with stigma or eye- 

 spot. In the eighth he treats of vacuolization of the surface of swarming 

 Chrysomonadineae. 



Pyrenoid in Cryptomonadineae.§ — P. A. Dangeard, having previously 

 shown the existence of a pyrenoid (not enclosed in the chromatophore) 

 in Cryptomonas erosa and G. cyanea, now states that he has found one in 

 Rhodomonas baltica Karst. = R. marina Limm. = Cryptomonas marina 

 Dang. The two genera are difficult to distinguish in practice, but 

 Rhodomonas possesses only one chromatophore, and Cryptomonas two. 

 Rhodomonas mari7ia is a photophobe, divides longitudinally, and can form 

 palmelloid colonies. The presence or absence of a pyrenoid serves for 

 separating genera in the alg^ ; and the author suggests that the same 

 might serve for a generic distinction in the Cryptomonadineas also. 



* Ber. Deutsch. Bot. Gesell., xxix. (1911) pp. 517-23 (1 pi.). 

 t Ber. Deutsch. Bot. Gesell., xxix. (1911) pp. 523-33 (1 pi.). 

 t Archiv f. Protistenkunde., xxii. (1911) pp. 299-344 (16 pis.). 

 § Bull. Soc. Bot. France, Iviii. (1911) pp. 449-52. 



