ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 563 



cesses. He kept his species in company with Bacterium coli, on which 

 it feeds. By means of the secretion of its contractile vacuole it agglu- 

 tinates the microbes ami ingests them. Their changes within the 

 Amoeba are described. 



From the cultures of amoebae the author obtained a proteolytic 

 ferment, approaching trypsin, and this seems to be the digestive agent 

 within the food -vacuoles. 



Parasites of Rotifers.* — A. M. Przesmycki divides the parasitic 

 organisms found inside Rotifers into two groups. The first group in- 

 cludes forms which attack living Rotifers and gradually kill them ; 

 their nature remains obscure, but they seem to correspond to the 

 *' parasitic vesicles " described by Bertram and compared by him to 

 Chytridiaceae. 



The second group includes forms which find entrance only into 

 moribund Rotifers. Thus the author describes (1) Endoplirys roLi- 

 toriorum g. et sp. n. — a Heliozoon — nor unlike Nuclearia ; (2) Dimcerium 

 hyalinum g. et sp. n., a plastic form, occurring in flagellate, amoeboid, 

 and encysted phases. These two new forms and a third less fully 

 discussed are facultative parasites, and are not peculiar to dying 

 Rotifers. 



New Parasitic Infusorian.f — M. Siedlecki describes Herpetophrya 

 astoma g. et sp. n. found as a parasite in the body-cavity fluid of 

 Polymnia nebulosa. The structure, movements, and transverse fission 

 are described. The position of the new form is in the family Opalinidae, 

 near Anoplophrya Stein and Monodontophrya Vejdovsky. 



Two new Dinoflagellata.$ — 0. Zacharias describes two new repre- 

 sentatives of the genus Glenodinium — Gl. apiculatum sp. n. from the 

 Eckbergsee near Plon, and Gl. lemmermanni — commemorating the work 

 of a most industrious algologist — from the great lake of Plon. 



Action of Blood-Serum on Paramoecium.§ — Ledoux-Lebard has 

 made numerous experiments on the effect of the blood-serum of various 

 animals on Paramoecium. The movements of the Infusorians are 

 weakened, and they soon cease alt )gether. The individuals give off 

 faecal particles which adhere together and to their producers, which 

 then become agglutinated in radiating or irregular aggregates. 



Marine Phosphorescence.|]— Fr. Weitlauer gives a graphic descrip- 

 tion of five different types of marine illumination— mainly due to 

 Noctiluca. 



Observations on Protozoal— J. Y. Simpson has made a number of 

 observations on the ultimate structure of Protozoa, e. g. of the macro- 

 nucleus of Ciliata, as exhibited by intravital staining. He also discusses 

 protective encystment in the case of the Ciliata, and has obtained the 

 cysts of Paramoecium and Spirostomum which were not previously known 

 to encyst. His opinion is that all the Ciliata would be found to possess 



* Bull. Acad. Sci. Cracovie, 1901, pp. 358-408 (3 pis.). 



t Tom. cit., pp. 356-32 (1 pi.). 



X Zool. Anzeig., xxiv. (1901) pp. 307-8. 



§ Ann. Inst. Pasteur, xvi. (1902) pp. 510-21. 



II Verb. Zool.-bot. Ges. Wien, lii. (1902) pp. 270-7. 



t Proc. Scot. Micr. Soc, iii. (1901) pp. 90-108 (2 pis.). 



