14 THE ENTOMOSTRACA OF 



Carapace tumid, rounded : valves strongly convex, especially on the posterior third ; 

 rounded obliquely and subacute anteriorly, semicircular posteriorly; arched on the 

 dorsal, nearly straight on the ventral border : surface finely punctate with pedicles of 

 setae. Lucid spots in System B. 



Dorsal aspect sub-oblong ; anterior, broadly ovate. 



This variety differs from C. Broumiana, from Clacton, in its smaller size, greater 

 rotundity, more acute anterior extremity, and more frequent setation. It is of rare 

 occurrence, and found as yet only in the fresh-water clayey sand of Grays in Essex.^ 



For these and other specimens from Grays and Copford I am indebted to John 

 Pickering, Esq. 



No. 3. Cypris Ovum, Jiirine, sp. Plate I, fig. A a, Ab. 



MoNOCULUs Ovum, Jurine. 1820. Hist, des Monocles, &c., p. 179, t. 19, figs. 18, 19. 

 Cypeis vulgaris, Zadduch. 1844. Syiiop. Crust. Pruss. Prodomus, p. 35. 



— MiNUTA, Baird. 1850. Nat. Hist. Brit. Entom., p. 155, t. 18, figs. 7, 8. 



— — Jones. 1850. Ann. and Mag. Nat. Hist., 2d ser., vi, p. 28. 



— PANTHEBiNA, S. Fischer. 1851. Ueber das Genus Cypris, &c., p. 163, t. 11, 



figs. 6—8. 



— Oyvm, Liljeborff. 1853. De Crustaceis, &c., p. 113, t. 10, figs. 13 — 15. 



— (Cypeia) Ovum, Zenker, 1854. Monographic der Ostracoden, &c., p. 79, t- 3, b. 



INCH. 



Lengtli, Jjj Recent: England; Europe. 



Post-tertiary : Cambridgeshire. 



CarajMce small, tumid, egg-shaped : valves highly convex, triangularly oval ; dorsal 

 margin arched and almost angular, ventral straight ; ends rounded, posterior extremity 

 broadest : surface finely punctate. In the recent state the valves are beset all round 

 towards the 'margins with slioi't hairs ; and they are of a light-brown colour, with a 

 tinge of green {Baird). 



Dorsal aspect broadly ovate ; anterior, nearly round. 



Common in ponds and stream. Abundant in the marl of the Peat-deposits of 

 Cambridgeshire described by Mr. Hamilton in the ' Quart. Journ. Geol. Soc,' vi, 

 p. 451. 



1 For the geological conditions of the Pleistocene and Post-tertiary deposits in Essex, see {Grays) 

 Loudon's 'Mag. Nat. Hist.,' 1836, ix, p. 261 ; 'Mag. Nat. Hist.,' n. s., 1838, ii, p. 546 ; {Clacton) 'Mag. 

 Nat. Hist.,' n. s., 1838, ii, p. 163, and 1840, iv, p. 197; ' Proc. Geol. Soc.,' 1845, iv, p. 523, and ' Quart. 

 Journ. Geol. Soc.,' i, p. 341; {Copford) Loudon's 'Mag. Nat. Hist.,' 1834, vii, p. 436, and 1836, ix, 

 p. 429 ; 'Proc. Geol. Soc.,' 1843, iv, p. 164 ; ' Quart. Journ. Geol. Soc.,' 1852, viii, p. 184. 



