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REPORT ON ZOOLOGY, MDCCCXLII: 
intercellular passages of plants (Amt. Ber. iiber die 20te Versamml. d. 
deut. Naturf. und Arzte zu Mainz, Sept. 1843, p. 227). 
Erdl has observed and described a peculiar circulation of the green 
globules in the body of the Bursaria vernalis (Miill. Arch. 1841, p. 278). 
The reporter has seen this circulation very distinctly in Loxodes hur- 
saria, and supposes that Erdl has had the same animal before him, but 
to which he has assigned an erroneous name. 
The organs of motion of a large Navicula have been recognised by 
Ehrenberg as long, fine, and contractile threads, which the animal can 
protrude from the shell (Abhandl. d. Kon. Akad. d. Wissench. zu Berlin, 
1841, p. 102). 
According to Morren, the red pigment spots of Lagenella, Crypto- 
glena, and Trachelomonas, cannot be eyes (Mem. de TAcad. Roy. des 
Sciences and des Belles Lettres de Brux. 1841, taf. 14), as in Trachelo- 
monas, the red of the red spot can be distributed over the whole body, 
when the animal, on this supposition, would be quite changed into an eye. 
Neither does he consider the cavities in these Monades to be stomachs, 
although he has seen a mouth and anal opening in Euglena sanguinea. 
Focke has mentioned, that Pandorina morum and other proboscidated 
Monades, appear to change very much in colour according to tempera- 
ture and season ; and he found, in green and in red water, individuals 
quite colourless, as well as Monades saturated with the pigment (Ber. 
fiber die Versamml. d. Naturf. und Arzte zu Mainz, a. a. 0. p. 217). 
Voigt has published his observations on the red snow (ibid. p. 217 ; 
the Microsc. Journ. 1841, p. 81 ; ITnstit. 1842, p. 259), the colour of 
which, according to him, is not caused by vegetable, but always by animal 
matter. The chief part of the snow is formed by the genus Oyges, the 
young of which has been considered by Shuttleworth as an Astasia, 
while the uncoloured shoots, by which the Gyges propagates itself, have 
been brought under the genus Pandorina. Besides these different forms 
of development of Gyges, there is also a peculiar Bacillaria and the 
Philodina roseola in the red snow. 
Ehrenberg found, at Wismar, in the Baltic, that the Peridinium tripos 
and fusus belonged to the phosphorescent Infusoria, but some emitted 
light (Fror. N. Notiz. Bd. 24, p. 152). The latter animals were quite clear, 
while the phosphorescent individuals were filled with yellowish-brown 
matter, which he considered to be developed ovaries, so that here also the 
development of light appears connected with the development of the egg. 
Experiments have been made by Purkinje, in the warm season, with 
rain water, in regard to the production of Infusoria (ibid. Bd. 22, 
p. 121 and 136, or Ubers. der Arbeit, der Schles. Gesellsch. fur Vaterl. 
Kultur im Jahre, 1841). In moist weather, their production was but 
sparingly observed ; but in dry weather, manifold forms of these animals 
quickly appeared, belonging principally to the genera Gonium, Volvox, 
Proteus, &c. 
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