Ostracoda new to Britain. 61 
that, though very much compressed, the tendency to a radiate 
arrangement of the lacune (?) is continuous throughout. 
I first found this species in a pond at Fenham, near Newcastle, 
in April of the present year; and it has since been taken by the 
Rev. A.M. Norman in two ponds near Sedgefield, county Durham, 
and again by myself near Whitburn, in the same county. 
Genus Canpona, Baird. 
Candona virescens, n. sp. Pl. IV. figs. 1-5. 
Carapace elongated, compressed, rather higher in front than be- 
hind ; ventral margin slightly sinuated; dorsal margin very 
gently arched ; anterior and posterior margins rounded. Sur- 
face of the valves smooth. Seen from above, the carapace is 
compressed, widest in the middle, and tapering gradually to- 
ward the extremities. Colour a delicate sea-green, irregularly 
variegated with markings of a lighter hue. Filaments of su- 
perior antenna five long and seven short. Length --23 inch; 
height -34,. inch. 
This species was found in considerable abundance in a shallow 
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 however 
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 sete 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. reptans possess 
these setz quite distinctly developed. 
Candona albicans, n.sp._ PI. IV. 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 
opake white, uniform or with pellucid patches. Length 
3%, inch ; herght +36; 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 
