CARBONIFEROUS ENTOMOSTRACA. 



Koninck's Cypridina Udtvarchiana is a CyprideUa, his Cypridina anmdata a Cyprella, and 

 his Cyjmdina concentrica an Entomis, and that numerous Cytkera (Tertiary and Creta- 

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

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

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

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



On the other hand, M. Bosquet's Cyprella ovidata and C. Konincliiarm, 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. G, 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 Cypridina 

 ovidata, Koninckiana, and Edwardsiana (Bosquet). 



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

 synonyms, see page 7. 



I 



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



Daphnia peijleva, 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 Kirkhy, 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 Z'). 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 



^ Prof. M'Coy quoted the Baphnoidia of Hibbert (' Trans. Roy. Soc. Edin.,' 1834, vol. xiii, p. 180 ; 

 D. Ilibberti, Moms, 1843), as a synonym, but we do not see any relationship. Indeed, "Baphnoidia" 

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

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



