20 THE ENTOMOSTRACA OF 



Dorsal profile lanceolate, or elongate-oval, with the ends acute and nearly equal : 

 anterior, broadly ovate. 



Candona Candida is very common in the mud of ponds and rivers ; and occurs 

 equally abundantly in the peat-deposits of Berkshire (at Newbury), and Cambridge- 

 shire ; in the shell-marl of the Forfarshire lakes, described by Sir C. Lyell, ' Geol. 

 Trans./ 2d ser., vol. ii, p. 73 ; in the fresh-water beds at Copford ; and in the pleisto- 

 cene beds of Clacton and Grays, in Essex. 



No. 5. Candona (?) sub^qualis, spec. nov. Plate I, fig. 9 a — 9 c 



INCH. 



Length, ^ Recent? 



Post-tertiary : Essex. 



Carapace rather large, very convex, reniform ; anterior and posterior extremities 

 nearly equal; dorsal margin arched, the curve being nearly uniform throughout its 

 length ; ventral margin incurved. Surface thickly studded with fine pimples, or 

 pedicles of setae. Lucid spots 7 — 8, forming four iiTegular oblique rows (System a). 



This species differs from C. Candida in its shape, setation, and lucid spots ; but 

 resembles it in general character. It much resembles in outline Cypris lutraria, Koch 

 CDeutsch. Crust.,' xxi Heft, t. 15), and C. elliptica, Baird ('Hist. Brit. Entom.,' 

 p. 158, t. 19, fig. 12) ; but the means of comparison at command are unsatisfactory. 



Candona (?) subcequalis occurs not uncommonly in the post-tertiary fresh-water 

 deposit at Copford, near Colchester. 



Sub-c/enus (?) — Cyprideis, nov. 



[At page 9 (in a note added while these sheets were in the press,) I have mentioned 

 my reasons for expecting that, on further examination, this form will prove to be a 

 Cythere. As I have not had any opportunity of getting living specimens, I leave the 

 description of this interesting and pecuhar form in the place it occupied in my MS., 

 and under the same provisional subgeneric heading. (November, 1856.)] 



AnimaV- having the pediform antennae hooked, not plumous, and the superior 

 antennae apparently simply setiferous. Carapace oblong; marginal edges thickened. 



1 Not vet examined in a fresh state. 



