BEITISH FRESHWATER EHIZOPODA. 225 



colourless, finely granular ; pseudopodia of two kinds — one 

 lobular or digitate, protruding centrally from the mouth of the 

 test, and terminated by a short pointed apiculus ; the others 

 (two or more) projected laterally, straight, thin, and tapering. 



DlFFLTJGIELTiA APICTJLATA, Sp. nov. (PI. 26. fig. 7.) 



Test ovoid in lateral view, membranous, smooth ; the sides 

 curving evenly from the crown downwards to the mouth. Endo- 

 plasm granular, colourless, or with a faint greenish tinge. The 

 nucleus inconspicuous. 



Dimensions : length of test 40 ju ; greatest breadth 30 jx. 



Amongst vegetation, chiefly floating algse, in the stream 

 above refered to, near Barking, Essex, May 1901. 



The abnormal structure of the pseudopodia in this organism 

 is its distinguishing feature. Individuals were kept under 

 observation for a considerable time, and in all cases presented 

 the same characters, showing conclusively that they were 

 not accidental. The form of the mouth could not be made 

 out, the membrane about it being apparently thin and flexible. 

 The central digitate pseudopodia were always more or less 

 active (the apiculus particularly so), whilst the lateral more 

 elongated and acicular ones were comparatively rigid and 

 changed but little. 



EXPLANATION OF PLATE 26. 



Figs. 1 & 2. Pejiardia mutahilis, gen. et sp. nov. 1, an active individual ; 

 2, the same, after capturing a small rotifer. From Epping Forest. 

 About X 350. 

 3 & 4. Mastigamceha aspera, E. Schulze. 3, an active adult individual, 

 showing the ilagellum ; 4, another individual — temporary phase — in 

 which the flagelium, though distinctly seen when the animal was 

 active, is concealed. From separate localities in Lancashire and 

 Cheshire. X 350. 

 5 & 6. Vampyrella flahellata, sp. nov. Characteristic phases of a single 

 individual, when active. From Barking, Essex. X 500. 

 Fig. 7. BiffliK/iella apiculata, gen, et sp. nov. From Barking, Essex. X 500, 

 8. Amcebapilosa, sp. now From Chelford, Cheshire. X 350. 



m^S. JOURK. ZOOLOGY, VOL. XXIX. 16 



