160 BRITISH ENTOMOSTRACA. 



Cypris. Tlie others are deficient in this apparatus, and 

 instead of swimming gaily through the limpid element, 

 crawl in the mud at the bottom of the pools in which they 

 are found, or creep along the aquatic plants which grow 

 there, and if dropped into a glass of water, fall to the 

 bottom, without being able to suspend themselves for the 

 shortest time. These constitute the genus Candona, which 

 I first published in the ' Trans. Bervv. Nat. Club,' ii, p. 

 152, 1845, and afterwards in the ' Ann. and Mag. Nat. 

 Hist./ xvii, p. 414.* 



1. CANDONA LUCENS. Tab. XIX, fig. 1. 



CTPRIS LUCENS, Baird, Trans. Bcnv. Nat. Club, i, 100, t. 3, f. 15, 1835. 

 CYFKIS CANDIDA, Baird, Mag. Zool. and Bot., ii, 131-, t. 5, f. 3. 

 CANDONA CANDIDA, Baird, Trans. Bonv. Nat. Club, ii. 353, 18-15. 

 CYPRIS PELLUCIDA, Koch, Deutsch. Crust., h. xi, t. 5, 1837. 

 CYPRIS LTJCIDA (?), Koch, Deutsch. Crust., h. xxi, t. 18, 1838. 



Shell somewhat reniform, arched on the upper margin, 

 and sinuated underneath. The valves are ventricose in 

 the middle, smooth, except round the edges, which are 

 fringed with fine short hairs, shining, of a pure white 

 colour, with a pearly lustre, and nearly opaque. The 

 anterior extremity is narrower and flatter than the pos- 

 terior, which is prominently arched on the upper angle, 

 and prolonged interiorly to a short point. 



I lab. - - Neighbourhood of London, Cockburnspath, 

 Yetholm, &c. ; summer and autumn months. 



:2. CANDONA RKPTANS. Tab. XIX, figs. 3, 3. 



Cvi'Kis I;I;ITANS, />V//v/, Trans. Berw. Nat. Club, i, 99, t. 3, f. 11,1s:!;, ; 



Ma- ZOOL and I'.ot., ii, l.Vi, t.5, f. 5. 

 .I/. l-:,/ir,i,-'lx, Hist. Nat. Crust., iii, -100. 

 CANDONA REFTANS, ./>',',>/, Trans. Bmv. Nat. Club, ii, 153, IS I."). 



Shell ovate elliptical, nearly plane on upper margin, 

 and slightly sinuated underneath. The valves arc rather 



* For further characters of tliis irmus, srr thr (Wiiir < nhM 



ofllir ' Kntumostrara c.l' I lie Cretaceous Formation of England,' by T. 

 Jones, Esq., publishing l>v ilic Patoontotrrajiliical Snciri\. 



