ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
497 
but rather that the individuals undergo a slow development during the 
warm months. The author found that in all his specimens two longitu- 
dinal flagella developed simultaneously at an early stage ; these flagella 
have been seen by other authors, but only as an occasional abnor- 
mality. Another peculiarity not hitherto observed is that the longitudinal 
flagella sometimes expand at their ends into little vesicles of varying 
size and number. These are probably to be regarded as degeneration 
products due to the dying of the flagella. 
Green Amoebae.* — Prof. A. Gruber describes a case in which a colony 
of Amoeba and Paramsecium bursaria flourished for about seven years 
without animal food, in virtue of their partnership with zooclilorellse, 
which sustained a holophytic mode of nutrition. 
Myxosporidia.j — Dr. Fr. Doflein gives a useful summary of recent 
contributions to our knowledge of Myxosporidia. They are Rhizopod- 
like parasites found especially in fishes and Arthropods ; occurring in 
almost all kinds of tissue, in cysts, in diffuse infiltration, or within the 
cells ; propagating themselves by means of spores, and also in some cases 
multiplying within their host by multiple plasmotomy or otherwise, 
causing a variety of diseases, such as the pebrine of silkworms (due to 
Glugea bombycis ) and the PocJcenkranJcJieit of carp (due to Myxobolus 
pfeifferi). They are usually referred to the Sporozoa, but the author 
lays stress on their Rhizopod affinities, and on the approximation of 
Rhizopods and Sporozoa. 
* Ber. Nat. Ges. Freiburg i. Br., xi. (1899) pp. 59-61. 
t Zool. Centralbl., vi. (1899) pp. 361-79 (9 figs.). 
