12 CARBONIFEROUS ENTOMOSTRACA. 



Koninck's Cypridina Edtoardsiana is a Cypridella, his Cypridina annulata a Cyprella, and 

 his Cypridina concentrica an Entomis, and that numerous Cythera (Tertiary and Creta- 

 ceous) were formerly called " Cypridina)," we must draw attention (as we have elsewhere) 

 to the fact that none of the Devonian " Cypridinee " which have given a name to a 

 formation (" Cypridinen-Schiefer," &c.) are CypridincB, but for the most part 

 Entoviides, &c. See also " Palaeoz. Biv. Entom./' Geol. Assoc, 1869, p. 4. 



On the other hand, M. Bosquet's Cyprella ovulata and C. KonincHana, from the 

 Chalk of Maestricht ('Mem. Soc. Roy. Sciences Liege,' vol. iv, 1847, p. 373, pi. iv, 

 figs. 4 and 5 ; and ' Mem. Commission Carte Geol. Neerlande,' vol. ii, 1854, pp, 124, 125), 

 and his Cyprella Edwardsiana, from the Lower Tertiaries of France (' Mem. Cour. Acad. 

 Roy. Belgique,' vol. xxiv, 1852, p. 132, pi. 6, fig. 14), are true Cypridina, as now 

 understood by a wider knowledge of the genus, and especially the recognition of the 

 notch and beak in M. Milne-Edwards's typical species. Among known recent species 

 Cypridina Bairdii, G. S. Brady, is, perhaps, the nearest to the above-mentioned Cypridince 

 ovulata, Koninckiana, and Edwardsiana (Bosquet). 



For a list of the known recent species of Cypridina and their more important 

 synonyms, see page 7. 



1. Cypridina prim^va (M'Coy). Plate II, figs. 24, 25, 26, 27 a—c, 28. 



Daphnia pkim^va, M'Coy} 1844. Synops. Char. Carb. Foss. Ireland, p. 164, pi. xxiii, 



fig. .5. 

 Cypridina — Jones, 1854, In Morris's Catal. Brit. Foss., 2nd ed., p. 104. 

 — — Jones and Kirkby, 1866. Annals Nat. Hist., ser. 3, vol. xviii, 



p. 41 ; 1867, Trans. Geol. Soc. 

 Glasgow, vol. ii, p. 218, and vol. iii, 

 Suppl., 1871, p. 27. 



Carapace subequivalve, subglobose, or of a compressed egg-shape ; oval in outline, 

 nearly equilateral ; notched anteriorly, at the middle, with a deep sinus and wide 

 triangular gape (fig. 27 b). End-view compressed-oval. Edge view narrow-oval. 



This much resembles Cypridina Japonica, Brady (' Trans. Zool. Soc.,' vol, v, pi. 62, 

 fig. 8) in shape, but wants the posterior prickle or spur, and differs somewhat in the 

 gape, which is cruciform in C. Japonica. It is still more like C Norveyica, Baird 

 ('Proc. Zool. Soc' Annulosa, pi. 71, fig. 4) ; but in the latter the notch is smaller and the 

 gape cordiform. 



Fig. 27 a matches Prof. M'Coy's Daphnia primava in shape and size (according 



1 Prof. M'Coy quoted the Daphnoidia o( Hibbert ('Trans. Roy. Soc. Edin.,' 1834, vol. xiii, p, 180; 

 D. Hibberti, Morris, 1843), as a synonym, but we do not see any relationship. Indeed, '' Daphnoidia" 

 appears to be indeterminable (' Annals N. H.,' I. c, p. 34), or it may be a crushed specimen of Leperditia 

 Scotoburdigalensis. M'Coy mentions no special locality for C. primceva. 



