142 BRITISH FRESHWATER RHIZOPODA. 



It " is readily distinguished by its small size, 

 green colour, and habit." And he adds : " The green 

 colour ... is due to the presence of a more or 

 less diffused chlorophyll in the protoplasm of the body. 

 This has most likely been acquired by the animal 

 whilst feeding on the numerous small green algae with 

 which it was associated. The protoplasm, which is 

 poured out from the mouth of the shell in quantity, 

 has a dull and somewhat translucent appearance, and 

 exhibits no visible granulation. Nor is a continuous 

 streaming movement to be observed in the pseudopodia, 

 the general movements of which are very slow." 



Genus 48. RHYNCHOGROMIA Ehumbler, 1894. 



Rhynchogromia RHUMBLER in Zeits. wiss. Zool. LXVII 



(1894), p. 590. 

 Gromia PENARD (pars) in Rev. Suisse Zool. VII (1899), 



pp. 89, 97. 



Animal enclosed in a chitinous, rigid or flexible, 

 elongated envelope encrusted with foreign particles; 

 aperture terminal or slightly oblique ; plasma finely 

 granular, nearly or quite filling the test ; one or more 

 nuclei ; one or more contractile vesicles or vacuoles 

 usually present ; pseudopodia arising from a peduncle, 

 numerous, branched, anastomosing, often investing 

 the exterior of the test. 



The plasma and pseudopodia of the Rhynchogromige 

 are similar in character to those of the Lieberkuehniae, 

 but the test is usually composed of a considerable thick- 

 ness of silicious particles, and it is much larger. 



Rhynchogromia nigricans is the only species so far 

 recorded from the British Isles. 



1. Rhynchogromia nigricans (Penard) Rhumbler. 

 (Plate LVI, fig. 10.) 



Gromia nigricans 

 PENARD Faune Rhiz. Leman (1902), pp. 568-570, 3 figs. ; Sarcodines 



grands Lacs (1905), pp. 115, 596. 

 MURRAY in Proc. Roy. Soc. Edinb. XXV (1905), p. 605. 



