244 Dr C. Vogt on the Animalcules of the Bed Snow* 



obliquely placed ; they are colourless in the variety from the 

 Alps, whilst they are red or yellow in the common variety. 

 Next comes the pharynx, with its two teeth, from whence the 

 intestinal canal proceeds, which, in the figure given by Dr 

 Vogt, is of a blue colour, the animal having been fed on in- 

 digo. The intestinal appendages are distinguished from the 

 ovary by their intense red colour. The foot, capable of ex- 

 pansion and contraction, is also seen. It is composed of seven 

 rings ; the fifth and sixth are armed with two points, the 

 seventh is furnished with two claws, very much analogous to 

 the posterior feet of the Chenilles. On either side of the body 

 may be seen, in four diff'erent places, the organs which Ehren- 

 berg described as vibratile branchiae, but which, in reality, are 

 nothing more than enlargements of two lateral vessels given 

 off from the respiratory tube and furnished with cilia. Simi- 

 lar vibratile enlargements are seen at the union of the neck 

 with the body, in two situations in the middle of the body, and 

 one at the side of the anus. The head and neck, as well as 

 the feet, may be withdrawn into the coriaceous carapace of the 

 body, which is susceptible of considerable dilatation and con- 

 traction. Fig. 2 represents those imperfectly developed eggs 

 which have been mistaken for Protococcus. Fig. 4 shews the 

 form of the winter-eggs not developed, with the covering in 

 the form of a rosette ; both the one and the other are met 

 with in red snow. Fig. 3 represents an accumulation of the 

 ordinary eggs of Philodina, collected from the crevices of the 

 polished surface below the glacier of Rosenlain ; the number 

 is by no means limited. 



The red snow of the upper glacier of the Aar and that of 

 Siedelhorn furnished us with Philodinas and eggs of different 

 forms, similar to Protococcus. The lower glacier, and that of 

 Finsteraar, presented us with all the organisms noticed in this 

 communication. * 



* The above addition to the Natural History of Red Snow we had marked 

 in last July for insertion in the present Number of our Journal ; we there- 

 fore gladly avail ourselves of the translation of it from the May number of 

 the Bibl. Univ. de Geneve, in *' The Microscopic Journal,^* a periodical 

 which we trust will ere long take a prominent place in our scientific litera- 

 ture.— Edit. 



