12 THE ENTOMOSTRACA OF 



Genus — Cyprois, Zenker. 1854. [Cypris, Auct. ? Notodromas, Liljeb. 1853.) 

 i 



Animal like Cypris, excepting that the eye is almost completely divided, and the 

 mucus-gland of the male genital apparatus is differently constructed. Carapace like 

 that of Cypris. (To this genus Zenker refers C. monacha, Muller, and C. dispar, 

 Fischer.) 



Genus — Notodromas, Liljeborg. 1853. (Cypris, Auct. ? Cyprois, Zenker. 1854.) 



Animal like Cypris, excepting that the eye is double, — the second pair of maxillae 

 have no branchial appendage, — and the pencil of setse on the lower pair of 

 antennas is very long. Carapace resembling that of Cypris. Liljeborg quotes C. 

 monacha, Muller, only as belonging to this genus. Probably Zenker's genus Cyprois is 

 the same as this ; but some important points of comparison are still required to be 

 worked out before, in this as in other instances, the researches of MM. Liljeborg and 

 Zenker can be estimated at their full value.] 



No. 1. Cypris setigera, Jones. Plate I, fig. 6 a — 6 d. 



Cypris setigera, Jones. Annals and Mag. Nat. Hist., 2d ser., vi, p. 25, t. 3, fig. 3 a — c. 



INCH. 



Length, ^ Recent? 



Post-tertiary : Berkshire and Cambridgeshire. 



Carapace ovate, somewhat pear-shaped : valves convex ; obliquely curved on the 

 dorsal, and nearly straight and somewhat incurved on the ventral border ; narrower 

 and tapering anteriorly ; bordered by a narrow rounded marginal rim ; covered with 

 fine spines : hinge-line occupying rather more than the central third of the dorsal edge : 

 right valve narrower, straighter on the dorsal, and more incurved on the ventral margin, 

 than the left valve. Lucid spots six, arranged on two transverse parallel rows. 

 (System b, see p. 5.) 



Dorsal aspect acute-oval ; anterior, oval. 



Plentiful 1 in the Peat-deposits of the Kennet Valley 2 at Newbury, and in the Peat- 

 marl of Cambridgeshire. 3 



1 Probably this is also a recent species, although it has as yet apparently escaped notice. The some- 

 what similar carapaces figured and described by earlier authors are not sufficiently elucidated for exact and 

 satisfactory comparison. 



2 For an account of these Peat-deposits, see the Appendix to my Lecture on the Geology of Newbury 

 &c, p. 40, 1854. 



3 See 'Quart. Journal Geol. Soc.,' vi, p. 451. 



