294 Dr. V. Sterki on a new Infusorian. 



large anterior cilia, with the anterior part forwards. Nothing 

 was to be observed of a newly formed posterior circlet of cilia, 

 as in the Vorticeilinas and other Peritricha. 



I have several times seen indubitable commencements of 

 transverse division, in the form of a second, smaller, circlet 

 of cilia placed laterally on the body, which could not be inter- 

 preted as any thing else. Unfortunately I had not the oppor- 

 tunity of observing its development further. 



It remains to say a word or two with regard to the tube 

 mentioned at the commencement of this paper. It is about 

 0*035 millim. in diameter, and becomes as much as # 40 millim. 

 long. Composed of the remains of macerated parts of plants, 

 small fungoid and algoid filaments, &c, it is formed in the 

 same way as the similar but shorter and less distinct tube of 

 Stichotricha, by the accumulation of the masses brought toge- 

 ther by the stream of water set up by the animal around its 

 body, which are then pressed together, and as it were felted 

 by pressure and the movement of the body in the interior. A 

 rusty-red colour appears to be only accidentally caused by the 

 material which happens to be present. The tubes were of 

 equal width from one end to the other, and not closed behind, 

 or only by masses which had accidentally fallen in. As they 

 are generally much longer than the animal, and the latter is 

 always seated near the extremity, it is evident that it must 

 detach itself from time to time, and again attach itself more 

 towards the end. 



I observed Tintinnus semiciliatus here in Schleitheim in 

 January and February 1878. I obtained some dozens of 

 specimens. They occurred in long-stagnant water containing 

 Alga3, on the surface of which a covering of fungoid and 

 algoid filaments had been formed ; the animals occurred prin- 

 cipally in these masses. 



Postscript. 



I have the opportunity of adding on the proof that I ob- 

 served some specimens of this species in February of the 

 present year (1879). They occurred on plants in the aqua- 

 rium, sometimes without a tube, sometimes with a short 

 one, which now did not show the yellowish colour. All 

 the essential characters just described were exhibited in 

 the same manner ; so that the species may be regarded as 

 confirmed. 



