222 Algae. — Eumycetes. 



Palmer, T. Ch., The apparatus oflocomotion in Surirella. 

 (Proc. Del. Co. Inst. Science. V. p. 146—156. fig. 3. July 1910.) 



An investigation of the facts as to the protoplasmic nature of 

 the keel-contents of Surirella, with particular reference to Lauter- 

 born's theory as to locomotion. The following conclusions are 

 reached: 



1. Bütschli granules, or bodies of the same deportment in life, 

 circulate into the keel and run along its base. 



2. Staining the living diatom with Bismark brown and tannic 

 acid fails to indicate coleoderm within the keel, though revealing 

 it in the same preparations upon Eiinoiia and Pinnularia. 



3. After rapid killing and fixing, both eosin and iron-alumhae- 

 matoxylin show the keel-canal more or less füll of a substance 

 continuous with the protoplasm of the rib-canals, and staining like 

 it, and showing the same granulär Constitution. 



It is considered as demonstrated that the protoplasm of Surirella 

 extends through the ribs with the keels, where in it runs from 

 end to end of the diatom, occupying most of the tubelike canals. 

 It is this hyaline protoplasm, flowing back and forth in the keels 

 and operating upon the surroundings through the minute clefts, 

 which produces all the various movements of the diatom. Moore. 



Paulsen, O., Marine Plankton from the East-Greenland Sea 

 (W. of 6° W. Long, and N. of 73° 30' N. Lat.) collected du- 

 ring the "Danmark Expedition" 1906— 1,908. III. Peridi- 

 niales. (Medd. Grönland. XLIII. 11. p. 303—318 with' 17 figs. 

 Köbenhavn 1911.) 



This is a systematical list of all the species of Peridinians found 

 in the plankton samples collected by the Danmark-Expedition in 

 the Sea off northern East-Greenland. The number of species is 

 26; most of them have been figured, and remarks on "their syste- 

 matical value, synonymy etc. are added. Peridinium varicans, Pauls, 

 is a new species. The author proposes a practical mode of designa- 

 tion of the plates which constitute the cell-wall of the Peridinians, 

 viz.: the apical plates are named by ordinary numbers (1 — 4), the 

 antapical plates by Roman numbers (I— II), the precingulars by small 

 letters (a — g), the postcingulars by capitals (A — E). 



A very peculiar organism which occurs fixed to the seta of 

 Chaetoceras boreale and which seems to suck out its contents has been 

 referred to Apodiniiim Chatton, with some hesitation, and is descri- 

 bed as A.Q) Chaetoceratis Pauls. C. H. Ostenfeld. 



Eriksson, J. F., Zach's cytologiche Untersuchungen über 

 die Rostflecken des Getreides- und die Mykoplasma- 

 theorie. (Sitzunsrsb. kais. Akad. Wiss. Wien. CX1X. p. 1043—1050. 

 1910.) 



Verf. konstatiert vorerst dass die von Zach angeführten Arbei- 

 ten anderer Autoren, die nach Zach's Ansicht als Stütze gegen 

 die Richtigkeit der Mykoplasmatheorie herangezogen werden kön- 

 nen, in Wirklichkeit nicht nur die Mykoplasmatheorie in der neue- 

 ren Form nicht widerlegen sondern sogar, wie Eriksson in einzelnen 

 Publikationen selbst nachgewiesen, weitere Beweise für deren Rich- 

 tigkeit bringen. Verf. kommt dann auf die eigenen Untersuchungen 



