IN NORTHUMBERLAND AND DURHAM. 149 
valves irregularly marked with slightly impressed grooves, and 
clothed with scattered hairs; lower portions of the anterior and 
posterior margins edged with spines, which are short and directed 
upwards and outwards, and are in number eight to ten in front, 
and about seven behind. Viewed from above, the carapace is 
compressed, widest in the middle, and gradually and equally 
narrower towards the extremities. The height greatly exceeds 
the breadth. The filaments of the superior antennz are very 
long. The ground-colour is an ashy brown painted with a cen- 
tral patch and a marginal zone of a pale buff. Length ,% inch ; 
breadth not quite <4 inch. 
Found in extreme abundance among Zygnema nitidum, in 
October, 1860, in the Forge Dam at Sedgefield—the same habitat 
which, as already mentioned, first gave the Cypris punctillata. 
This year the species is comparatively scarce. 
It is not without considerable misgivings that I have placed 
this species provisionally in the genus Candona. It undoubtedly 
belongs to that genus as first constituted by Dr. Baird, and has 
close relationship with our common species, Candona reptans. 
Prof. Liljeborg has, however, taken Candona lucens as the 
type of the genus, and having shown that the anatomical features 
of the former species are inconsistent with those of the latter, 
has excluded Candona reptans from among the Candone, and 
inserted it in the genus Cypris, of which, together with Cypris 
lucida (Koch) and Cypris Jurinii (Gaddach), he has made it a 
section. This section is characterised by having ‘the sete at- 
tached to the interior of the third joint of the inferior antenne 
short, and not reaching to the apex of the nails of the last joint.” 
According to Liljeborg’s arrangement, therefore, the present 
species would fall into his Section B. of the genus Cypris. It is 
not improbable that further observation may point out the ex- 
pediency of constituting a new genus to receive these interme- 
diate forms. Notwithstanding the length of the filaments of the 
superior antenne, the shortness of those of the inferior antenns 
render Candona serrata like Candona reptans, utterly unable to 
sustain itself in the water. It is remarkably active, however, on 
its feet, and runs with great agility. 
