BRITISH FRESHWATER EHIZOPODA. 



forms are met with which seem to emit pseudopodia 

 only at opposite poles of the oval body, as Cienkowski, 

 and likewise Penard, figure it. The filaments are not, 

 in any case, numerous. The body of the animal is 

 always pale; the pseudopodal threads are extremely 

 fine and transparent, divergent and widely spreading, 

 their branches anastomosing. No developmental pro- 

 cess has yet been detected in Gijmnoplirys. Two 

 individuals which were under observation at one time 

 came into actual contact, but they did not incorporate, 

 nor was there any blending of their pseudopodia. 



Genus 8. BIOMYXA Leidy, 1875. 

 Biomyxa LEIDY in Proc. Acad. Nat. Sci. Phil. 1875, p. 124. 



Body consisting of finely-granular protoplasm, semi- 

 fluid and colourless ; initial form sub-spherical ; the 

 body capable of much elongation, and branching out 

 into a network of fine anastomosing filaments, which 

 are generally massed at the extremities, but may also 

 emanate from different points of the surface. 



From Gymnoplmjs this genus is distinguished by the 

 habit of the body to elongate, and of the finer pseudo- 

 podia to become massed at the extremities, whilst from 

 Penardia the pale colourless endoplasm clearly marks 

 it off. From the latter it is further separated by 

 general habit (being purely a chlorophyl feeder) and 

 by its more dilatory movements. 



1. Biomyxa vagans Leidy. 

 (Plate VIII, figs. 3 and 4.) 



Biomyxa vagans LEIDY in Proc. Acad. Nat. Sci. Phil. 1875, 

 p. 125, and Freshw. Rhiz. N. Amer. (1879), p. 281, 

 t. xlvii, ff. 5-12 ; t. xlviii, ff. 8, 12 (?) ; COEBADO in Boll. 

 Scient. I, an. 2 (1880), p, 47; GRIFFITHS & HENFREY 

 Micr. Diet. ed. 4 (1883), p. 98; GRUBER in Nova A eta 

 Acad. Caes. Leop. XLVI (1884), p. 503, t. ix, ff. 27-31 ; 

 BOLTON in Midi. Nat. IX (1886), p. 174; WHITELEGGE in 



