RAPHIDIOPHRYS VIRIDIS. 37 



of the freshwater Heliozoa, the largest colonies being 

 just visible to the naked eye. It is a species that 

 appears to be very local in its occurrence as he found . 

 it in only about six localities and the pools which it 

 inhabited did not number more than a dozen out of 

 the large numbers that existed there. 



It is curious that there has been no other record 

 of it in Great Britain since it was first described by 

 Archer. 



It has been recorded from the continent of Europe 

 and North America. 



2. Raphidiophrys elegans Hertwig & Lesser. 

 (Plate LXX, fig. 1 .) 



Raph idiophrys elegans 



HERTWIG & LESSEE Arch. mikr. Aiiat. X, 1874, Suppl. p. 218, pi. iv, 

 f. 1. 



LEIDY Rep. U.S. Geol. Surv. XII. 1879, p. 250, pi. xlii. ff. 1-6. 



PENARD Heliozoaires, 1904, p. 170, fig. 

 Sphserastrum conglobatum 



GREEPF Arch. mikr. Anat. XI, 1875, p. 29, pi. ii, ff. 24-26. 



Body small, more or less spherical, usually in 

 colonies, the individuals a little distance apart, but 

 connected by bands of plasma ; the outer gelatinous 

 envelope crowded with sub-circular, disc-shaped 

 spicules having thickened edges and forming elon- 

 gated cone-shaped accumulations around many of the 

 pseudopodia; ectoplasm containing numerous granules, 

 with ot- without green particles and seldom living 

 green algal cells ; endoplasm slightly eccentric, trans- 

 parent ; nucleus single, placed eccentrically, contain- 

 ing a large nucleolus ; one contractile vesicle normally 

 present ; pseudopodia numerous, long, straight, smooth 

 or granuliferous, their axes arising from a central 

 granule. 



Diameter of body 30 ju, to 40 /A ; length of pseudo- 

 podia up to three or more times the diameter of the 

 body ; spicules 7 /M to S /u, in length and about (> ^ in 

 breadth. 



