154 M. E. Penard's Notes on some Heliozoa. 



pletely emptied, the Vampyrella emits pseudopodia, becomes 

 detached, and moves away, leaving a very visible rupture in 

 the empty cell. It then often goes to the next cell, or even 

 to a third, and, having emptied these in the same manner 

 and become greatly enlarged, it encysts itself. At this 

 moment it has lost its brick-red tint, which is at the utmost 

 visible here and there in spots in the greenish mass with 

 which its body is stuffed. Later on it will divide within its 

 cyst into several embryos, which will pierce a hole and issue 

 one after the other, already clothed in their fine red colour. 



To return to the nutrition of the Vampyrella : this is 

 effected, in my opinion, by a true phenomenon of suction, the 

 whole body of the animal acting as a sucking-cup ; what 

 would seem to be opposed to this view is that the cell of the 

 Alga as it is emptied does not flatten under the pressure of 

 the surrounding liquid ; but it is possible that the cell, as it 

 loses its original contents, gets filled with water through the 

 partition which separates it from the following cell, or even 

 through the whole of its own wall. 



Another organism to which I wish to call attention is a new 

 form of Heliozoon which I have met with this summer in 

 considerable abundance, but only on one occasion. The 

 body, which is very small (about 15 micros) and of a reddish 

 tint, is normally spherical, but is subject to very rapid defor- 

 mations of considerable amount, though always tolerably 

 thickset and retaining its distinct outline ; the ectosarc, a thin 

 lighter band, is traversed by a line of very small tangential 

 spicules, but has no radiating ones ; the pseudopodia, which 

 are hyaline, sparingly granular, excessively long, filiform, and 

 thicker at the base than at the apex, are in very small number. 

 The animal runs like a spider by means of its pseudopodia, 

 leaping to one side or straight forward with surprising agility, 

 so that it progresses almost as rapidly as a Flagellate. It has 

 sometimes appeared to me even to swim freely in the water, 

 and can at any rate beat with its pseudopodia, which, how- 

 ever, have nothing to do with real flagella. This organism 

 possesses an excentric nucleus in a clear endosarc, and a con- 

 tractile vesicle. There is no doubt that it is a true Heliozoon, 

 which resembles some Amoebae in the plasticity of its body 

 and in the nature and restricted number of its pseudopodia 

 {Anvxba radiosa). 



Lastly, I have a few words to say upon another organism 

 which 1 also found in abundance this summer at Wiesbaden, 

 but only in a single locality. It is a true Monad, spherical, 

 of small size (10-15 micros), with two very clear flagella 

 which I have often seen boat in u - and drawing food into a 



