OSTRACODA NEW TO BRITAIN. 107 
weedy pond at Ashburn, near Sunderland, in May, 1863. In 
shape it closely resembles Dr. Baird’s figures of C. similis ; and 
some specimens have, when fresh, two dark spots, which how- 
ever disappear on drying: they seem to correspond with the eye 
and muscle-spots. When I first found my specimens I supposed 
that they might prove to be merely the young of C. reptans, as 
they are not unlike in shape to that species, though much paler 
in colour. But the absence of any brush of set on the lower 
antenna is of itself a sufficient character to separate the two 
species. I find that even the very youngest specimens of C. rep- 
tans possess these sete quite distinctly developed. 
CaNDONA ALBICANS, n. sp. (PI. IIL, figs. 6-10.) 
Valves oblong. Dorsal margin straight, curving abruptly 
at the posterior extremity, and more gradually in front; 
ventral margin deeply sinuated; extremities obtusely 
rounded off. Surface of the valves uniformly and closely 
punctated, with a few scattered slender hairs round the 
anterior and posterior margins. Seen from below, the 
carapace is flattened, ovate, and produced into a fillet at 
the anterior extremity. Colour opaque white, uniform or 
with pellucid patches. Length +29, inch ; height ,38, 
inch. ' 
I took a single specimen of C. albicans (from which the ac- 
companying drawings were made) in fresh water near Sunder- 
land, in 1861. It has been found plentifully this year, in a small 
grassy pond near Sedgefield, by the Rev. A. M. Norman, in com- 
pany with ©. lucens, Cypris tristriata, C. affinis, C. ovum, &e. 
With reference to his specimens, Mr. Norman remarks: ‘ This 
Species approaches very near to C. lactea (Baird), but is wider in 
proportion to its length, is not so ventricose, and wants the con- 
spicuous encircling fillet of that species. The surface in C. albi- 
cans 1s excavated with very numerous, small, shallow pits; but 
in C. lactea it is only sparingly and finely punctate.” In the 
figure of this species, the sinuation of the lower margin is not 
sufficiently pronounced. 
