24 BRITISH FRESHWATER RHIZOPODA. 
Haliiat.—Wet moss and sphagnum. 
Eneianp.— Westmorland and Derbyshire (Brown). 
Scotranp.—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- 
Fie. 167,—Pyzsidicula 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. 
15b. MICROCORYCIA Cockerell, 1911. 
Corycia Dusarpin in Ann. Sci. Nat. (3) XVIII (1852), p. 
241. (Pre-occupied in Lepidoptera, 1816.) 
Amphizonella (pars) Gregrr in Arch. mikr. Anat. IT (1866), 
pp. 829-330. 
ase 5 a CockereLL in Zool. Anzeig. XXXVIII (1911), 
p. : 
