IIETEROPHRYS MYRIOPODA. 31 



Distribution. - - X. WALES. - - Llyn - y - cwm - ffynon 

 (West). 



IRELAND. Wicklow (Archer) . 



The body is nearly always crowded with symbiotic 

 green algal cells (Chlorella vulgaris Beyerink), which 

 hide all view of the endoplasm and nucleus in the 

 living animal ; mixed with these Penard found starch 

 grains and pale blue spherules, which are readily 

 coloured by carmine and might be mistaken for 

 nuclei. 



The nucleus is normally spherical but may be 

 deformed by the pseudopodial axes 'radiating from the 

 central granule. 



The aspect of the outer envelope when examined in 

 a dry state is much altered and shows in addition to 

 the fringe of spicules, which are all that are visible in 

 water, that the whole of this zone is densely crowded 

 with innumerable needle-like spines, 12 p, to 14 ^ in 

 length, some attached together by their bases in pairs, 

 others radially in threes, the whole forming an almost 

 felt-like layer around the body of the animal. 



The pseudopodia are exceptionally numerous and 

 long; from a comparatively thick base they taper 

 gradually to a fine point, the axes being coated with 

 finely granuliferous plasma which occasionally forms 

 slight swellings. 



The species is exceptionally active for a heliozoan ; 

 Penard states they can travel at the rate of 125 ^t in 

 30 seconds with a rolling motion. 



2. Heterophrys fockei Archer. 

 (Plate LXVIII, fig. 3 ; PL LXIX, fig. 3.) 



Heternphrys Fockii 



ARCHER Qrt. Jrn. Micr. Sci. (N. s.) IX, 1869, p. 267, pi. xvi, f. :3 ; 



H. Fockei PENARD Heliozoaires, 1904, p. 157, fig. 

 Sphserastrum conglobatum 



ARCHER Qrt. Jrn. Micr. Sci. (N. s.) XVI, 1876, p. 356 (HOW S. 

 conglobatum GREEFF Arch. mikr. Anat. XI, 1875, p. 29, pi. ii, 

 ff. 24-26). 



