162 BRITISH ENTOMOSTRACA. 



than posterior, upper margin slightly arched, and inferior 

 edge somewhat sinuated. The valves are flatter than in 

 almost any other species, pellucid, and quite smooth. 

 The colour is of a dull white, without any spots or marks. 

 The C. detecta of Miiller is quite a different species from 

 the Monoc. conchaceus of Jurine, though that author 

 quotes them as synonymous, in which, though with hesita- 

 tion, he is followed by M. Edwards. These synonyms, 

 therefore, as qu<jted by me in the ' Mag. Zool. and Bot.,' 

 must be expunged. 



-^«3.— Neighbourhood of London ; Pool on Beaumont 

 Water, &c. ; not common. 



5. Candona siMiLTs. Tab. XIX, figs. 2, 2«. 



Candona similis, Baird, Traus. Berw. Nat. Club, ii, 153, 1845; Ann. 

 and Mag. Nat. Hist., xvii, 415, t. 9, f. 4. 



Shell somewhat elliptical in figure, flat, shghtly sinu- 

 ated in the middle of the lower margin, and nearly plane 

 on dorsal edge. The colour is white, with two dark- 

 orange spots on the back. The valves are smooth, except 

 round the edges, which are fringed with rather stiff" hairs ; 

 these are more numerous on anterior extremity than on 

 posterior. The shell is narrower posteriorly than ante- 

 riorly, and is transparent. Its motion is very deliberate, 

 when it walks along the plants, first putting one foot for- 

 ward, and then leisurely drawing up the other. It ap- 

 proaches near to the C. detecia of Miiller ; the posterior 

 extremity, however, is narrower than anterior, which is 

 the reverse in the detecta. 



Hah. — Pond on Clapham Common, July 1846. 



Family II— CYTHERIDJE. 



Cytherinen, Roemer, Jahrbuch, 1S3S, 



Character. — Two pairs of antennsB ; superior not fur- 

 nished with the pencil of long filaments. Feet, three pairs. 



This family contains two British genera — Cythere 

 and Cythereis. 



