158 BRITISH FRESHWATER RHIZOPODA. 



coloured ; plasma granular, with numerous clear 

 vacuoles and chlorophyllous particles ; pseudopodia 

 simple, not digitate ; nuclei several. 



1. Zonomyxa violacea Niisslin. 



(Plate XXXII, figs. 20 and 21.) 



Zonomyxa violacea NUSSLIN in Zeits. wiss. Zool. XL, 4 

 (1882), p. 697, t. xxxv, ff. 1-23; and in Jrn. R. Micr. 

 Soc. (2) IV (1884), p. 908; PENARD in Rev. Suisse Zool. 

 XIV, 2 (1906), p. 115, t. iv, ff. 4-7. 



Body relatively large ; its initial form more or less 

 discoid, changing to pyriform when in motion, broad 

 posteriorly, then narrowing convexly, but with a more 

 or less uneven outline to the anterior extremity, from 

 which, through a narrow slit in the membranous 

 envelope, a single lobe of ectoplasm is emitted. This 

 pseudopodium is colourless, simple, without any ten- 

 dency to branch or become digitate, and has an acu- 

 minate point. Body of the test violet-tinted, protected 

 by a transparent or yellowish chitinoid membrane, 

 which, being flexible, adapts itself to the changes of 

 form assumed by the living animal during progression. 

 The membrane anteriorly is fine and extensible, yield- 

 ing readily to pressure from within. Several nuclei 

 as many as four may be detected in the granular 

 endoplasm, and also numerous vacuoles. 



Dimensions : Diameter, in a state of repose, 140- 

 160 p, ; length when extended or in active motion 250 /u, 

 or more (Penarcfy. 



Detected by Dr. Penard in a gathering of Sphagnum, 

 sent to him from Midlothian by Mr. W. Evans, 1906. 

 Not reported from any other part of Britain. 



We have no personal acquaintance with this appa- 

 rently very distinct organism, which in this country 

 seems to be extremely rare. It is clear from Dr. Penard's 

 exhaustive description in ' Rev. Suisse de Zool./ that, 



