26 BRITISH FRESHWATER RHIZOPODA. 



Test discoid, formed of a yellowish -brown, homo- 

 geneous, flexible membrane, the crown convex, the 

 periphery prolonged into a diaphanous membrane 

 capable of completely closing in the base of the test ; 

 the crown usually sparsely covered with small adherent 

 foreign particles ; plasma partly filling the test, the 

 ectosarc colourless and limpid, the endosarc containing 

 numerous minute yellow-brown granules ; nuclei two 

 in number, usually placed close together ; contractile 

 vacuoles variable in number ; pseudopodia few, short, 

 lobular or broadly digitate. 



Diameter 80-100 /A or more; young and immature 

 individuals may be as small as 20 /A in diameter. 



Habitat. Mosses. 



ENGLAND. Westmorland (Brown)-, N. and W. York- 

 shire (Brown); Bedfordshire; Shropshire; Isle of 

 Wight ; Cornwall ; Isles of Scilly. 



WALES. Anglesey. 



IRELAND. Clare Island and Inishturk, Mayo ; Inish- 

 bofin, Galway. 



The synonymy of this species seems inextricably 

 mixed ; Cash, following Archer, refers Amphizonella 

 flava Greeff to PseudocMamys patella Clap. & Lachm. 

 (Vol. I, p. 129) ; Penard, whose name for this species 

 is now generally adopted, points out (' Archiv f . 

 Protist.,' Vol. XVII, p. 260) that the earlier writers 

 in many cases gave insufficient descriptions and often 

 no drawings of the species described ; also that Corycia 

 [Microt'orycia'] flava when young or immature closely 

 resembles the adult Pseudochlamys patella and both 

 species possess tests capable of taking a variety, of 

 shapes. The plasma however is very distinct in the 

 tw.o species. M. flava usually lives only in the drier 

 mosses, such as grow on trees, walls, and rocks, and 

 also in those growing on the ground. From such 

 situations the tests are liable to be carried into ponds 

 where Pseudochlamys patella is usually found. 



