8 
THE ENTOMOSTRACA OE 
itself near the centre of the inside of each of the valves, without any corresponding pit 
or pits existing on the external surface. In Cytliereis a large external tubercle is always 
present on the central line in the anterior third of each valve, having a corresponding 
internal circular pit. How far M. de Koninck may be correct in considering similar 
tubercles existing in Cypridincd to be adapted to the eyes of the animal we are not 
prepared to say ; and, although the sub-genus Cythereis exists in the recent state, we 
have hitherto met with dead valves only, and have had no opportunity of examining 
what relation the eyes may have to these tubercles in a living specimen. In 
Cythere proper the tubercle referred to above is not present ; a slight central pit, however, 
sometimes exists on the internal surface of the valves. Lastly, the exterior of the 
carapace-valves of the Ostracoda varies from a perfectly smooth convexity to a flat 
or irregular surface, variously ridged, tubercled, granulated, spined, reticulated, or 
pitted. 
Genus Cythere, Miiller. 
Cythere, Muller. 1785. Entomostrac. 
Monoculus, Gmelin. 1791. Syst. Nat., ed. 13. 
— • Fabricius. 1792. Entom. Syst. 
— Manuel. 1792. Encycl. Method. Hist, nat., tom. vii. 
Cythere, Latreille. 1802. Hist. nat. Crust. 
— Bose. 1802. Hist. nat. Crust. 
— Bumeril. 1806. Zool. Anal. 
Cytherina, Lamarck. 1818. Hist. nat. An. s. Vert, first ed. 
Cythere, Straus. 1821. Mem. du Museum, tom. yii. 
— Destnarest. 1825. Consid. gener. Crust. 
Cytb.^e.th'SI A, Hisinffer and Nilsson. 1827. Petrif. Suec. 
Cythere, Miinster. 1830. Jalirh. f. Miner. &c. 
— Milne Edwards. 1834. Hist. nat. Crust. 
Cytherina, Sowerby. 1834. Geol. Trans., sec. ser. vol. y. 
Cythere, Baird. 1838. Mag. Zool. Bot., vol. ii. 
Cytherina, Lyell and Lonsdale. 1838. Elem. Geolog. 
— Roemer. 1838. N. Jahrb. f. Miner. &c. 
— — 1840. Verstein. Kreid. &c. 
Cythere, De Koninck. 1842. Descript. Anim. Foss. &c. 
— M‘Coy. 1844. Synop. Charact. Foss. &c. 
Cytherina, Phillippi. 1844. Tertieer. Verstein. &c. 
— Reuss. 1845. Verstein. Bohm. Kreid. 
Cythere, Cornuel. 1846. Mem. Soc. Geol. France, sec. ser. tom. i. 
Cytherina, Williamson. 1847. Trans. Manchest. Lit. Phil. Soc., vol. viii. 
— Bosqrtef. 1847. Mem. Soc. Roy. Scienc. Li^ge, tom. iv. 
Generic Characters. — The section of this genus, for which we reserve the term 
Cythere proper , is characterised by a general resemblance of the closed carapace to a 
^ Descript. Anim. foss. &c. p. 586. 
