CEYPTODIFFLUGIA. 79 



Penard describes three species of Gryptodifflugm, all 

 very minute, and differing from one another in the 

 form of the test and degree of compression, whilst 

 agreeing in the yellowish or golden-brown colour of 

 the chitinous material of which the test is composed. 



1. Cryptodifflugia oviformis Penard. 



(Fig. 78.) 



Cryptodifflugia oviformis PENARD in Mem. Soc. Geneve, 

 XXXI (1890), 2, p. 168, t. vii, if. 95-107; and Faune 

 Khiz. Leman (1902), p. 425, if. 1-4 (p. 426). 



Test ovoid in broad view, minute, compressed, con- 

 sisting of chitinous membrane, yellowish (becoming 



FIG. 78. Cryptodifflugia oviformis. From Cader Idris, N. Wales. 

 a, broad view ; b, two individuals in conjugation ; c, narrow view, 

 x 480. 



brown with age), with few or no foreign particles 

 adhering ; narrowed evenly from the semi-circular 

 crown downwards to the small, truncated (in face view 

 oval) mouth, the corners of which are obtusely angular. 

 Plasma granular, with an inconspicuous nucleus situ- 

 ated posteriorly, and a varying quantity of minute 

 chlorophyllous food-particles, and clear vacuoles. 



Dimensions: Length 16-20 p; breadth 12-15 /A; 

 in narrow view 8 /x. 



In marshy ground amongst Sphagnum ; slopes of 

 Cader Idris, August, 1903. 



This is one of the smallest of the Difflugian rhizopods. 

 Examples met with in Wales were slightly broader 

 proportionately than those represented in Penard's 

 figures ('Faune Khiz. Leman,' p. 426, fp. 1, 2), but 



