1-1-2 



CRETACEOUS L.OrELLTBRAXCTTTA. 



the postcro-dorsal side of the hitter, but in examples in which the umbones are 

 more anterior in position the median cardinal is dorsal to the anterior cardinal, 

 and is almost continuous dorsally with the posterior cardinal tooth. 

 Measurements : 



(3) (4) 



. 911 . 98 . 

 86 . 8G . 

 (1—8) BlackdowD. 



Affinities. — Specimens of Gijprlna from the Aptian and Gault of the Perte du 

 Rhone and Ste. Croix were referred by Pictet, Roux, and Renevicr, to G. ervyensis, 

 Leymerie, but were subsequently identified with C. auijitJitln hy Pictet, Renevier, 



\ 



Fig. 23. — Cyprina (Venilicardia) angxdata (Sow.). Upper Greeiisaud, lilackilown. MusuuiiX uf I'ractical 

 Geology, No. 18698. Right valve, and anterior view of both valves, x *. 



and Campichc.^ Pictet and Campiche, after an examination of specimens from the 

 Gault of Nievre and Yonne, came to the conclusion that G. ervyensis, as described 

 and figured by Leymerie- and d'Orbigny,^ must be regarded as a synonym of 

 G. angulata. I have had no opportunity of comi)aring French specimens with 

 examples from Blackdown, but so far as I can judge from the figures of G. eroyensis 

 tliere appear to be some differences, consequently I do not at present feel justified 

 in including G. crryensin as a synonym of G. anguhdd. 



1 Pictet and Rous, 'Moll. Foss. Givs verts de Geneve' (1852), p. 444, pi. xxxiv, fig. 1. Pictot and 

 Keuevier, ' Foss. Terr. Aptieu ' (' Matt'r. Pal. Suisse,' ser. 1, 185(3-58), pp. 75, 177. Pictet and CampicLe, 

 'Terr. Crct. Ste. Croix' ('Mater. Pal. Suisse,' ser. 4, 1805), p. 221. 



- ' Mem. Soc. gt'ol. de France,' vol. v (1842), pp. 5, 25, pi. iv, figs. 6, 7. 



3 ' Pal. Fraue. Terr. Cret.,' vol. iii (1844), p. 102, pi. cclxxiv. 



