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 Cythereis 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 Cypridina^ 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 jJToper 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 

 caranace-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, Milller. 



Cythere, Milller. 1785. Entomostrac. 

 MoNOCULUS, Gmelin. 1791. Syst. Nat., ed. 13. 



— Fabricius. 1792. Entom. Syst. 



— Manuel. 1792. Encycl. Method. Hist, nat., torn. vii. 

 Cythere, Latreille. 1802. Hist. nat. Crust. 



— Bosc. 1802. Hist. nat. Crust. 



— Dumeril. 1806. Zool. Anal. 



Cytherina, Lamarck. 1818. Hist. nat. An. s. Vert, first ed. 

 Cythere, 5/raMs. 1821. Mem. du Museum, torn. vii. 



— Destnarest. 1825. Consid. gener. Crust. 

 CYrE.ERW\, nisinffer and Nilsson. 1827. Petrif. Suec. 

 Cythere, Milnster. 1830. Jahrb. f. Miner. &c. 



— ' Milne Edwards. 1834. Hist. nat. Crust. 

 Cytheeina, Sowerby. 1834. Geol. Trans., sec. ser. vol. v. 

 Cythere, Baird. 1838. Mag. Zool. Bot., vol. ii. 

 Cttherina, Lyell and Lonsdale. 1838. Elem. Geolog. 



— Rcemer. 1838. N. Jahrb. f. Miner. &c. 



— — 1840. Verstein. Kreid. &c. 

 Cythere, Be Koninck. 1842. Descript. Anim. Foss. &c. 



— M'Coy. 1844. Synop. Charact. Foss. &c. 

 Cytherina, Phillippi. 1844. Tertiser. Verstein. &c. 



— Beiiss. 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. 



— Bosquet. 1847. Mem. Soc. Roy. Scienc. Liege, 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 



1 Descript. Anim. foss. &c. p. 586. 



