HYALOSPHENIA SINUOSA. 91 



8. Hyalosphenia sinuosa sp. nov. 



(Plate XXIV, figs. 1 and 2 ; and figs. 83 and 84 

 in text.) 



Test in front view elongated-pyriform, compressed ; 

 its crown semi-circular, with the sides tapering, each 

 with a crenulate outline, downwards to the truncated 

 mouth. The entire surface pitted with circular depres- 

 sions ; hyaline, colourless ; the mouth, in narrow lateral 

 view, forming a shallow notch. Plasma, seen through 

 the transparent membranous envelope, not filling the 



83 84 



Figs. 83 and 84. — Hyalosphenia smuosa: 83, broad view of an encysted 

 individual ; 84, narrow view of an active individual. From Dunham, 

 Cheshire, x 220. 



cavity, but reaching very nearly to the fundus, in 

 which region the nucleus — visible as a circular pale 

 space — is situated ; pseudopodia numerous, bifurated 

 or simple. 



Dimensions : Length 200-236 ju, ; breadth 1 10-125 /a ; 

 average breadth in narrow lateral view 65 /a. 



Found in tufts of Fhilonotis fontana, Dunham ; May 

 and September, 1891. 



This exceedingly fine species is not common. It is 

 readily distinguished by its pitted test, the pits being 



