34 I5R1TISH FRESHWATER HELIOZOA. 



R. intermedia Penard. Spicules short, elliptical in broad 

 view with curved ends in narrow view, not numerous and all 

 arranged tangentially ; pseudopodia tenuous, granuliferous. 

 Diameter 35 /z to 40 f.i. 



B. brunii Penard. Body small ; spicules numerous, small, 

 acicular, extending for a considerable distance along each of 

 the pseudopodia ; the pseudopodia are long, tenuous and 

 granuliferous. Diameter 12 /n to 13 //. 



It. coerulea, Penard. Body small ; spicules not numerous, 

 small, acicular, arranged tangentially around the body; 

 nucleus large ; contractile vesicles large, several in number ; 

 plasma bluish in colour ; pseudopodia long, tenuous, granu- 

 liferous. Diameter 13 jj. to 16 /i. 



R. ambigua Penard. Spicules comprising three kinds of 

 thin discs,, in broad view respectively oval, elongate oval and 

 fusiform, the latter extending for a considerable distance 

 along the pseudopodia; one or more contractile vesicles. 

 Diameter of body 30 /j. to 40 u ; size of spicules about 5 ju by 

 3u, 12 fj. by 3 JLL and 20 fj. by 2 /n respectively. 



R. symmetrica Penard. Spicules comprising two kinds of 

 thin discs, in broad view elliptical, one kind being about 10 /j, 

 in length, the other 8 n, both about 2'5 /m in width and slightly 

 curved in narrow side view, the larger of these forming 

 tubular-shaped investments around the pseudopodia for the 

 major portion of their length. Contractile vesicles one or 

 more ; pseudopodia tenuous, granuliferous. Diameter of body 

 20 jii to 25 ju or sometimes more ; diameter over spicular 

 investment up to 64 /j.. 



SYNOPSIS OF BRITISH SPECIES. 



Spicules spindle-shaped with flattened points ; usually in 

 colonies; diameter of body about 80 /u. (1) R. viridis. 



Spicules disc-shaped ; usually iu colonies ; diameter of body 

 about 30 n. (2) R. elegant. 



Spicules spindle-shaped, with acicular points ; usually 

 solitary; diameter of body about 55 /a. (3) 11. pa Hi da, 



1. Raphidiophrys viridis Archer. 

 (Plate LXIX, fig 2 ; PI. LXX, fig. 2.) 



Rapliidioplirys viridis 



ARCHEK Qrt. Jrn. Micr. Sci. (N.S.) VII. 1867, p. 179; op. cit. IX, 

 1869, p. 255, pi. xvi, f. 2. 



