RECENT MEMOIRS ON FRESHWATER RHIZOPODA. 347 



not say anything of the peculiar richness in vacuoles, and 

 further describes V. vorax as brick-red in colour, the possible 

 identity seems to the authors to be excluded. 



Although, then, there is a good deal of resemblance, the 

 authors could not relegate their form to the genus Vampy- 

 rella for the two reasons — the peculiar bubbly nature of the 

 protoplasm, absent in Vampyrella, and the presence of 

 nuclei, not yet demonstrated in Vampyrella (hence, as well 

 known, claimed as a Moneron). 



Vampyrella Spirogyrce, Cienk.i 



Cienkowski himself, in a subsequent paper,- touches on 

 the proposed genus Leptophrys (referring to L. cinerea) 

 and its relation to the above named. He again had an 

 opportunity to investigate his V. vorax, and re-examined it 

 with a view to decide if its colour were a constant feature as 

 to discover if it could assume a vacuolar consistence. 



In respect to the first inquiry, the author thinks it can 

 be answered in the affirmative. Digestive cysts of V. vorax 

 taken on the same occasion, amongst diatoms, showed red, 

 brown, and white cysts, side by side; the young form emerg- 

 ing from these followed the same colours ; those from the 

 white cysts were colourless, the brown gave greyish-brown, 

 and the red brick-coloured individuals. He is inclined to 

 conclude that the colour depends on the nature of the food, 

 though not proven ; hence Avould refer the red and brown as 

 well to V. vorax. 



Touching the vacuoles, as he had previously been looking 

 for contractile vacuoles only, he had given no attention to 

 the ordinary vacuoles. He now states V. vorax possesses 

 these in abundance, and hesitates not to refer L. cinerea 

 (written cinerasens by Cienkowski), Hertwig and Lesser, to 

 his own Vampyrella vorax. 



Aranchula impatiens, Cienk.^ (fig. 21) . 



With this name Cienkowski records a colourless, naked 

 protoplasmic being, with the general characters of a Vam- 

 pyrella, but distinguished by the presence of contractile 

 vacuoles and by anastomosing, but little branched, pseudo- 

 podia. One of the most usual forms assumed by it is that 

 of a long-drawn-out string, broadened out at the ends into 

 radiating lobes ; but such lobes may occur anywhere along 



^ " Beitrage zur Kenntniss der Monadeii " in ' Archiv f. Mikr. Anat.,' 

 Bd. i, pp. 203 et seq. 



2 Schultze's ' Archiv,' Bd. xii, p. 24. 



3 Cienkowski, loc. cit., p. 27, t, v, figs. 18—24. 



