des Naturalistes lie Moscoii. 255 



3. E. proboletes. The molar teeth straight, the laminas 

 raised, deeply scalloped, projected obliquely. 



4. E. pygmae^us. The molar teeth similar to those of E. 

 mammouteus, but more than one half less in size. 



5. E. campylotes. The molar teeth somewhat arched, the 

 laminae narrow, numerous, arched, a little raised. 



6. E. Kamenskii. The molar teeth somewhat arched, 

 narrowed at each side, laminae a little raised, numerous, 

 ringed in the middle. 



No. X. contains the proceedings of the Society at a meeting 

 held on October 26. 1829, in honour of the visit of Humboldt. 

 It is on the whole very interesting, but we can only notice 

 the observations made by Ehrenberg, a fellow-traveller with 

 Humboldt, on infusory animalcules. He has observed that 

 similar forms of these microscopic beings are to be found in 

 very different and remote parts of the world, as in Africa and 

 Europe; but there are several which are peculiar to each 

 or every country. During his travels in Siberia he found 

 113 different species, of which exact measurements were 

 taken, and drawings made. Of this number 85 perfectly 

 resemble those which he had previously observed near Berlin. 

 Four amongst them, however, form the types of as many new 

 genera, which, so far as is known, are peculiar to Siberia ; 

 but all the others are referable to genera already character* 

 ised. Ehrenberg was shown a red clot of blood which was 

 found in a marsh of the steppes Platowsky, situated between 

 Barnaoul and Colyvan, and which, he says, is a coagulated 

 mass of red Infusoria, here named Trachelium desertorum ; 

 a name, we may remark, which cannot be allowed, since 

 Trachelium is preoccupied in botany. He had observed 

 a somewhat similar phenomenon of water tinted red near the 

 Red Sea, in the bay Tor, at the foot of Sinai, whence perhaps 

 its name ; but the colouring substance (called Trichodesmium 

 erythrae\im) of the Red Sea resembles an ^Iga, or glutinous 

 aquatic filaments ; whilst the colouring matter of the marsh in 

 Siberia is derived from animalcules. 



Of the remaining numbers our limits permit us only to say, 

 that they will afford many observations of importance to the 

 scientific naturalist, and contain ample proof of the zeal of 

 the naturalists of Russia. 



N. 



