24 



BRITISH FRESHWATER RHIZOPODA. 



Habitat. Wet moss and sphagnum. 



ENGLAND. "Westmorland and Derbyshire (Brown}. 

 SCOTLAND. Argyllshire ( Brown] . 



Its larger size distinguishes this species from other 

 members of the genus ; the large open side which 

 serves as the aperture is devoid of any constriction, 

 but is furnished externally with a border of lighter 

 colour, faintly punctate and much thinner than the 

 body part of the test ; occasionally tests are found 

 from which the border is missing. 



The brown colour of the tests becomes darker with 

 age, and the punctate appearance under a high magni- 



FIG. 167. Pyxidicula cymbalum. 1, side view. x 500. 2, two indi- 

 viduals in conjugation, x 380. 3, upper view, x 270. (After Penard.) 



fication is seen to be due to its areolar structure of 

 small plates in closely set series ; the base usually lies 

 in one plane, but is sometimes found waved. 



Penard observed living individuals only in pairs, 

 either in conjunction or division apparently, the single 

 tests being all empty. 



15 b. MICROCORYCIA Cockerell, 1911. 



Corycia DUJARDIN in Ann. Sci. Nat. (3) XVIII (1852), p. 



241. (Pre-occupied in Lepidoptera, 1816.) 

 Amphizonella (pars) GREEFF in Arch. mikr. Anat. II (1866), 



pp. 329-330. 

 Microcorycia COCKERELL in Zool. Anzeig. XXXYIII (1911), 



p. 137. 



