of British Entomostraca. ; 415 
Genus CANDONA. 
Sp. 1. C. similis,n. s. Pl. IX, f. 4. 
Shell somewhat elliptical in figure, flattish, slightly smuated in 
middle of anterior edge, white with two dark orange-coloured 
spots on the back. It is smooth, except round the edges, which 
are beset with some rather stiff hairs, more numerous at anterior 
extremity than posterior, transparent, rather larger at anterior 
extremity than posterior. The feet have one long curved claw 
and one short. Pediform antennee (f. 4 a) have three strong 
curved claws at their extremities, but no bundle of long sete. It 
creeps upon the plants, &c. at the bottom of the water, and when 
_it walks it leisurely puts first one foot forward, then the other. 
It approaches Cypris detecta, Miiller; the posterior extre- 
mity however is narrower than the anterior, which is the reverse 
in the detecta. 
Hab. Pond on Clapham Common. 
Section 3. Copepoda. 
The genus Cyclops of Miiller, composed of very heterogeneous 
materials, required reform, and has accordingly been reviewed by 
M. Edwards, who, in his great work on the Crustacea, distin- 
guishes three different genera. The characters of these he takes 
from the structure of the second or inferior pair of antenne and the 
foot-jaws. In his genus Cyclopsina however he includes two spe- 
cies of Cyclops described by Miiller, which are very different from 
each other and cannot be placed together. The chief character of 
the genus Cyclopsina is the branched nature of the second or in- 
_ ferior pair of antennz, a character _which agrees well with the 
. structure of these organs in the Cyclops ceruleus of Miiller, but 
not with his C. minutus, in which the inferior antennze are sim- 
ps and not branched. I propose dividing this family into the 
ollowing genera :— 
Fam. CYCLOPID/&E. 
Head distinct from body, not possessing a moveable beak ; 
body consisting generally of four, abdomen of six segments ; foot- 
jaws two pairs, sometimes small ; legs about five pairs ; one eye. 
Genus 1. Cyciops, Miiller. 
Foot-jaws large and strong, branched ; second or inferior pair 
of antennze simple ; external ovaries double. 
The C. guadricornis, Miill., is the type of the genus. 
Genus 2. Cycitorsina, M@, Edwards. 
Foot-jaws of considerable magnitude, simple ; second or infe- 
rior pair of antennee branched ; external ovary single. 
The Cyc. ceruleus, Miller (Monoc. Castor, Jurine), is the type 
of this genus. 
