POMPHOLYXOPHin s. 41 



spherules arranged more or less regularly in concentric 

 layers, immersed in a small quantity of mucilaginous 

 matter ; contractile vesicles absent ; nucleus single, 

 placed eccentrically ; pseuclopodia elongate, non- 

 coalescing, acicular. 



All the species in this genus are of small size, the 

 body measuring from about 20 p, to 30 /z in diameter. 



The outer investment of spherules is continuous in 

 appearance but its components are not attached to one 

 another, being easily separated either for the protrusion 

 of the pseuclopodia or for the passage of food to the 

 interior. 



SYNOPSIS OF BRITISH SPECIES. 



Outer envelope formed of three zones or layers of spherules 

 each 2 fj. to 4 ^t in diameter. (1) P. punicea. 



Outer envelope formed of ovoid globules each 2 /u. to 3 /j. in 

 length. (2) P. ovuligera. 



P. exigua Hertwig & Lesser lias the outer envelope formed 

 of 5 or 6 layers of very small spherules measuring about '6 fi 

 in diameter and lias not up to the present been recorded 

 from the British Isles. Diameter of body 20 ^ to 30/,. 



1. Pompholyxophrys punicea Archer. 

 (Plate LXIX, figs. 4, 5.) 



Pompliolijxriplirys 



ARCHFR Qrt. Jrn. Micv. Sci. (N.S.) IX. 18fi9. p. 386. pi. xvi. ff. 4, 5. 



WEST Jrn. Linn. Soc. Zool. XXVIII. 1901. p. 3::'.'. 



PENARD Heliozoaires, 1904. p. 208, fig. 

 Hi/i/JoJii mpe fenestratn 



GEEEFP Arch. mikr. Anat, V. 1869, p. 501, pi. xxvii. f. :!7. 



LEIDY Rep. U.S. Geol. Surv. XII, 1879, p. 271, pi. xlv, f. 9. 



Body small, approximately spherical ; outer envelope 

 composed usually of three layers or zones of spherical 

 globules in a sparse mucilaginous investment ; ecto- 

 plasm clear, colourless or reddish, containing numerous 

 coloured granules of various sizes and green, yellow or 

 brown vegetable food particles ; endoplasm not dis- 

 tinctly differentiated ; nucleus large, placed eccentri- 



