110 BRITISH FRESHWATER RHIZOPODA. 



Test ovoid or pyriform, membranous, flexible, 

 colourless or yellow ; fund us rounded or pointed ; 

 transverse section oval, lenticular, or arcuate; aperture 

 terminal, small, supple, and elastic ; plasma colourless, 

 granular, completely filling the test, often containing 

 many food-particles; nucleus large and granular or 

 containing a small number of nucleoles ; one or two 

 contractile vesicles and numerous vacuoles generally 

 present; pseudopodia numerous, long, radiating, 

 branched or simple, extremely fine. 



Length 20-70 /x; mature individuals usually 45- 

 60 fjL ; breadth about half the length; thickness variable. 



Habitat. Submerged sphagnum and aquatic vege- 

 tation. 



ENGLAND. Sheffield district, W. Yorkshire (Brown) ; 

 Cheshire (Gash); Epping Forest, Essex (S cour field] . 



IRELAND. "W. Gal way, Westmeath, and Tipperary 

 (Archer). 



Owing no doubt to the difficulty of identifying it when 

 not active and to the fact that it is extremely local in 

 occurrence, the records of this species in the British 

 Isles are very few. It may be looked for amongst 

 filamentous alga3, where, entangled among their mucous 

 investment, .perhaps a number of individuals will be 

 found together. When replete w r ith food-particles it 

 is of a more or less dark brown colour. 



It is probably widely distributed in the British Isles. 



3. Lecythium granulatum (Schulze) Hopk. 

 (Plate XLIV, fig. 11 ; PI. L, figs. 1 and 2.) 



Gromia granulata 



SCHULZE in Arch. mikr. Anat. XI (1875), pp. 117-118, pi. vii, ff. 5, 6. 



ARCHER in Qrt. Jrn. Micr. Sci. (N. s.) XVI, p. 343 ; in Proc. Dublin 



Micr. Club, III, 2 (1878), p. 134 

 Pamphagus curvus 



LEIDY Freshw. Rhiz. N. Amer. (1879), p. 196, pi. xxxiii, ff. 11, 12. 



WEST in Jrn. Linn. Soc., Zool. XXVIII (1901), p. 331, pi. xxix, f.27. 



FOREL Le Leman, III (1904), p. 137. 



