POMPHOLYXOPHRYS. 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 ; pseudopodia elongate, non- 

 coalescing, acicular. 



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

 body measiaring from about 20 /x to 30 /x 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 pseudopodia or for the passage of food to the 

 interior. 



Synopsis of Buri'tSH Speciks. 



Oater envelope formed of three zones or layers of spherules 



each 2 fi to 4 fi in diameter. (1) P. punicea. 



Outer envelope formed of ovoid globules each 2 /x to ' 3 ju in 



length. (2) P ovuligera. 



P. exigua Hertwig & Lesser has the outer envelope formed 

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

 in diameter and has not up to the present been recorded 

 from the British lales. Diameter of body 20 /i to 30 ;j. 



1. Pompholyxophrys punicea Archei'. 

 (Plate LXIX, figs. 4, 5.) 



Pompholyxophrys punicea 



Archer Qrt. Jrn. Micv. Sci. (n.s.) IX, 1869, p. 386, pi. xvi, ff. 4, 6. 



West Jrn. Linn. Soc. Zool. XXVIII. 1901, p. 339. 



Pbnard Heliozoaires, 1904, p. 208, fig. 

 Hyalolampe fenestrata 



GRBEFr Arch. mikr. Anat. V, 1869, p. 501, pi. xxvii, f . 37. 



Leidt Eep. U.S. Geol. Siirv. 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 

 bi'own vegetable food particles; endoplasm not dis- 

 tinctly differentiated ; nucleus large, placed eccentri- 



