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 sinuosa: 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 /x ; breadth 1 10-1 25 /x ; 

 average breadth in narrow lateral view 65 ja. 



Found in tufts of Philonotis fontana, Dunham ; May 

 and September, 1891. 



This exceedingly fine species is not common. It is 

 readily distinguished by its pitted test, the pits being 



