ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
639 
Life-history of Paramceba eilhardi.* — Dr. Fr. Schaudinn found in 
the salt-water aquarium of the Berlin Zoological Institute a new amoeboid 
organism to which he gives provisionally the title Paramoeba eilhardi 
g. et sp. n. 
I. The amoeboid stage. The organism measures from 10-90 /x, is 
usually disc-like with blunt pseudopodia, is often yellowish-brown in 
colour, has a vacuolar honeycombed plasma with many granules in the 
endoplasm, and possesses a central vesicular nucleus with alveolar 
structure, and beside the nucleus a remarkable refractive accessory 
body unlike anything in any other Amoeba. In the process of division 
this accessory body seems to divide before the nucleus. 
II. The encysted stage. The vacuolar structure of the endoplasm is 
lost ; the pseudopodia are retracted ; a cyst-membrane is formed ; the 
accessory body, the nucleus, and the plasma divide successively. 
III. The flagellate stage. From the cyst there emerge oval swarm- 
spores with two flagella, an ingestive aperture, two chromatophores, 
and an accessory body beside the « nucleus. Except in the last point, 
they closely resemble species of Cryptomonas. They divide longitudin- 
ally, and eventually lose their chromatophores and become amceboid. 
Schaudinn is unable to decide in regard to the nature of the remarkable 
accessory body, but thinks the suggestion legitimate that it may have 
affinities with pyrenoids, centrospheres, and Nebenherne , without being 
any one of the three. 
* SB. K. Preuss. Akad., 1896, pp. 31-41 (12 figs.). 
