PLAOOCISTA JUEASSICA. 47 



Test smaller than in the preceding species and of 

 broader proportions, being sub-circular to ovoid in 

 broad view ; transverse section 'lenticular ; furnished 

 with acicular spines of various lengths which cover 

 the whole surface of the test but are less numerous 

 on the central portions ; body-scales sub-circular or 

 broadly oval, regularly imbricated; aperture-scales 

 sub-circular, forming undulate margins to the linear 

 aperture ; nucleus large, containing from one to 

 three nucleoles ; contractile vesicles obscure, usually 

 two or more ; plasma colourless ; pseudopodia not 

 observed. 



Length 70-76 /x. ; breadth 50-54 ^ ; aperture 20- 

 28 ju,; thickness about half the breadth; nucleus 17- 

 20 jx in diameter ; spines 6-18 ju, in length. 



Habitat. — Sphagnum. Rare. 



England. — • Harrop Tarn, Cumberland (Brown) ; 

 Chat Moss, Lancashire [Gash) ; Leckby Carr, JNT. 

 Yorkshire. 



Wales. — Snowdon, Carnarvonshire (Saunders, coll.). 



Scotland. — St, Kilda, Outer Hebrides (Broivn)-; 

 Pentland Hills (Gash) ; Stranraer, Wigtownshire 

 (Broivn). 



The spines may be solitary or in tufts of two to 

 four (PI. XLII, fig. 1); they are never flattened; 

 they may vary considerably in numbers and length. 

 The test is often opaque and rarely glabrous. 



3. Placocista lens Penard. 

 (Plate XL, fig. 10.) 



Eugly]}ha lens 



Pbnaed in Rev. Suisse Zool. VII (1899), pp. 78-79, 115, pi. vii, fC. 



20-24 ; op. oit. IX (1901), pp. 234, 237. 

 FOEEL Le Leman, III (1904), p. 137. 

 Placocysta lens 



Penaed Faune RHz. Leman (1902), pp. 514-515, 3 figs. ; Sarcodines 

 grands Lacs (3905), pp. 56-57, 109, 110, 2 figs. ; Sarcodines in Cat. 

 Invert. Suisse (1905), p. 106 ; in Proc. Roy. Soc. Edinb. SXV 

 (1905), pp. 595, 603-604, 608. 



