26 " Mr. T. R. Jones on some fossil Entomostraca. 



Plentiful in the freshwater deposit at Clacton, Essex. This 

 species is named after John Brown, Esq., F.G.S. of Stanway, to 

 whom I am indebted for the use of an interesting series of Ento- 

 mostraca collected by him from the Clacton beds. 



3. Cypris tumida, nobis. Length -^j inch. PL III. fig. 2 a, b, c. 



Caparace tumid, rounded. Valves strongly convex, especially 

 on the posterior third ; rounded obliquely anteriorly, semicircular 

 posteriorly ; strongly arched on the dorsal, and nearly straight on 

 the ventral border. 



Dorsal aspect suboblong, elongate- obtuse-ovate. 



Rather rare : at Grays, Essex. 



For this and the other species from Grays and Copford I am 

 indebted to Mr. Pickering of Thames Street. 



4. Cypris gibba, Ranidohr. Mag. Gesellsch. Naturf. Berlin, t. iii. 



fig. 13-17. Length ^V inch. PL III. fig. 4 «, h, c. 



Syn. Cypris biplicata, Koch,Deutsch. Crust. H. 21. 1. 16,1838. 



Carapace oblong. Valves rather depressed ; impressed with 

 closely-set, circular punctations j rounded anteriorly and poste- 

 riorly ; incurved at the middle of the ventral border ; deeply 

 marked across the centre by an irregular sulcus or two parallel 

 sulci, strongest towards the dorsal border. The extremities of 

 the recent carapace are fringed with fine hairs. Right valve some- 

 what smaller than the left. 



Dorsal aspect elongate-oval or lanceolate ; anterior ovate. 



Occurs in the deposits of Clacton and Grays. Common in a 

 recent state : Regent's Park, Notting Hill, Charing. — T. R. J. 



2. Genus Candona, Baird. 



Gen. Char. Animal creeping, provided with two pairs of antennae, 

 upper pair plumed, lower pair hooked ; and two pair of feet. 

 Inhabiting fresh and brackish water. 



1. Candona lucens, Baird, Brit. Entom. p. 160. n. 1. tab. 19. 

 fig. 1. Length y*j inch. PL III. fig. 8 a, b, c. 



Carapace somewhat reniform in the adult state, elliptical when 

 young. Valves convex, smooth, white and shining ; arched on 

 the dorsal, sinuated on the ventral border. Extremities narrow, 

 rounded; the posterior widest and produced obliquely downwards. 

 The recent shell is hairy at the margins of the extremities. 



Dorsal aspect elongate-acute-oval ; anterior acute-ovate. 



Common both in the recent state and in the deposits of New- 

 bury, Copford, Clacton, and Grays. 



