CYPRIDINA. 11 



DESCRIPTION OF THE CARBONIFEROUS GENERA AND SPECIES. 



I.— CYPRIDINA, Mihie-Edwards. 



Cypkidina, Milne-Edwards, 183". 



— Baird, 1840, 1848, 1850, 1860. 

 Daphnia, M'Coy, 1844. 

 Cypridina, Costa, 1845. 

 Cyprella, Bosquet, 1847, 1852, 1854. 

 Cypridina, Jones, 1849, 1854, 1856, 1869. 



— Adam White, 1850. 



— Dana, 1855. 



— Grube, 1859. 



— Claus, 1865. 



— G. S. -Bra</y, 1866, 18^. 



— JbwesandZiV^iy, 1866, 1867, 1871. 



— G. O. Sars, 1868, 1869. 



Carapace-valves rather thin and horny in the recent specimens, more soHd and 

 calcareous w^hen fossil ; ovate, oblong-oval, elongate-oval, or pyriform ; apiculate behind ; 

 notch distinct in front. The fossil are thicker than the recent shells ; partly, at least, 

 from mineralization. Muscle-spot frequently apparent. 



The ' Monograph of the Tertiary Entomostraca of England ' (Palgeontogr. Soc), 1856, 

 p. 9, where treating of the Family Cyprida, contains the following paragraph : — " I 

 may here mention that Cyprella and Cypridella, of M. De Koninck, probably belong to 

 a different group of the Entomostraca ; that M. Bosquet's * Cyprellse ' of the Cretaceous 

 and Tertiary deposits are true Cypridina ; and that De Koninck's ' Cypridina ' (of the 

 Carboniferous Limestone) is not the Cypridina of Milne-Edwards. In a courteous 

 reply to an inquiry with which I lately troubled M. Milne-Edwards, he kindly informed me 

 that the Cypridina described in the ' Hist. Nat. des Crust.' has really the antero- ventral 

 notch so characteristic of the genus." With regard to this important point in the history 

 of the genus, it is evident that, for want of the early indication of the presence of this 

 character, several fossil forms have been wrongly allocated by palaeontologists. Thus, 

 besides noticing^ that M'Coy's Daphnia primmva is a Cypridina, and that M. De 



1 See also ' Monog. Cretac. Entom., England' (Palseontogr. Soc), 1849, pp. 3, 5, and 36. 



