Prof. Ehrenherg's Researches on the infusoria. 



V. Suez on the Red Sea, in sea-tuater, — 2 Forms. 



Vorticella parasitica, n. sp. . 



89 



Zoobotryon pellucidus, n. sp. 



VI. Tor, on the Red Sea, in sea tjoater, wells, and infusions 



Forms. 



1 to 6 body \ 

 10 



Cyclidium glaucoma, Miiller, 



Disoma vacillans, n. g. 



Discocephalus rotatorius, n. g. 



Echinella splendida, n. sp. 



Fragilaria diophthalma, n. sp. 

 E. Kolpoda cucullus, M'uller, 

 E. Monas termo, Miiller, 



Stylonychia cimex, n. g. (Kolpoda 

 E. Trachelius lamella, 

 E. Vibrio rugula, Miiller, 



Vorticella arabica, n. sp. 



lamella, M'ulle: 



19 



1 

 s 



1 



35 

 TS54 



1 



54 



h 



) 35 



VII. Wadi Esle, in Mount Sinai, Observed at Tor, in the tvater 

 tvhich had been sent with confervcefrom Wadi Esle. — 18 Forms.* 



E ? Ambleyura serpentulus (Vib. serp. Miiller), . ^/' 



Anguillula fluviatilis. 



Bacterium scintillans, n. sp. 

 . E. Closterium lunula, Nitsch, . 



» ■ . multistriatum, n. sp. 



55 

 X55 



15 

 t'5 



£. Cocconema cistula, n. sp. 



Cyclidium glaucoma, Miiller, 

 * Fragilaria bipunctata, n. sp, 

 — — — multipunctata, n. sp. 



• Dr Ehrenberg carried on a series of observations on infusions, during a residence for some 

 time at Tor, in expectation of the arrival of Dr Hemprich, previous to setting out on a journey 

 Into Abyssinia. The following are the results of these experiments, in his own words : 



*' Towards the end of October, I placed, in a retired situation in the coral-house of the Greek 

 Nicola Barmili, four glass vessels containing well-water, sea-water, cold infusion of black pepper, 

 and cold infusion of cinnamon. After the first two days, on examining a few drops I could detect 

 no trace of life. The second day the surface of the water was a little dusty. The third day I de- 

 tected under the dust in the well and sea water, Monas termo and Cyclidium glaucoma. The 

 same animals existed in the pepper infusion with the addition of some Kolpoda cucullus. During 

 the eleven days in which I continued the observations without interruption, no trace of life could 

 be observed in the cinnamon infusion ; a few filaments of mould were only formed on its surface. 

 The well water and infusion of pepper, during the remainder of the eleven days, exhibited no more 

 animalcules. In the latter, however, the number of kolpodae seemed to increase, and that of mo- 

 nads to diminish. The sea-water was much more productive. On the fourth day there appeared, 

 in addition to the monads and cyclidia;. Vibrio rugula; on the eighth day, Stylonychia cimex, Tra- 

 chelius lamella, and Disoma vacillans. A journey to Mount Sinai now interrupted my observa- 

 tions for twelve days. On my return, on the 22d of November, I found all the glasses dried up, 

 except that of sea-water, which was larger than the others, in which the Stylonychia still exhibited 

 some active motions. No new forms were developed in this water, although I continued my ob- 

 servations for almost two months, the time required to evaporate it to dryness. The result of 

 these observations is, that, In stagnant well-water, and pepper infusion, European forms only ap- 

 peared ; but, in the stagnant sea-water, some which were peculiar. Further, that in Arabia as in 

 Europe, monads arc the first which appear in stagnant water." 



