32 BRITISH FRESHWATER HKLIOZOA. 



Sphasrastrum Foclcei 



WEST J. Linn. Soc. Zool. XXVIII, 1901, p. 338. 

 Heterophrys spinifera 



HERTWIG and LESSER Arch. mikr. Anat. X, 1874. Suppl., p. 215. 



pi. v, f. 3. 

 Heterophrys tenetta 



PENARD Jalirb. Nassau. Yer. Naturk. XLIII. 1890, p. 18. pi. i, 

 ff. 13, 14. 



* 



Body spherical but deformable ; outer envelope 

 thick, mucilaginous, with numerous, fine, radial spicules 

 partially embedded in it ; ectoplasm granular, with 

 various inclusions but seldom any green algae ; endo- 

 plasm bluish-grey, eccentric ; nucleus single, placed 

 eccentrically ; a central granule present from which 

 the pseudopodial axes originate ; contractile vesicles 

 large, numerous ; pseudopodia numerous, long, granu- 

 liferous. Habit solitary or in small groups ; somewhat 

 active. 



Diameter of bodv about 25 u. 



/ 



Habitat. Moorland pools, ponds, etc. 



Distribution. ENGLAND. Bricket Wood Common, 

 Herts (J. Hopldnson). 



N. WALES. Llyn Teyrn (West). 



IRELAND. - Wicklow, Cork, Kerry, Westmeath 

 (Archer). 



In the living animal the nucleus is rarely visible and 

 the application of some staining fluid is usually 

 necessary before it can be identified. 



3. Heterophrys radiata West. 

 (Plate LXVIII, fig. 4.) 



Heterophrys radiata 



WEST J. Linn. Soc. Zool. XXVIII, 1901, p. 337, pi. xxx. f. 34. 

 PENARD Heliozoaires, 1904. p. 160, fig. 



Body small, 'spherical; outer gelatinous envelope 

 colourless, thick, with a finely fimbriated outer surface ; 

 plasma dark grey in colour, filled with numerous 

 granules of various sizes; no differentiated endoplasm 



