CVIMMMERIA. Iy7 



from tliL' tJeiioinaniaii of Rouen. English specimens agree with tliose founcl at 

 Rouen, except that in many cases the shell is somewhat shorter relatively. The 

 surface is ornamented with concentric ribs. In I'. {Ci/cLurisiua) rotoindt/t'n.slti thu 

 shell is more convex, more inequilateral, and the postero-dorsal margin has a 

 greater slope than in C. {('i/c/iirismd) jiiirru.. The hinge appeal's to l)e uid<no\vn. 



Distribution. — Base of the Chalk Marl of Maitlen Newton and Chard. Chlorilic 

 Marl of Melhury, Woolcondte, Maiden Hi';idley anil the Isle of Wight.' 



CvriMMKKiA (Cvi'lokis.ma) faua {Soirrrlnj), 1.S27. IMate XXIX, Hgs. 7— 1:J. 



1827. Venus v\k\, J. dc C. Svwt;rhij. Miu. Cuiicli., vul. vi, p. 12!», [.Ldlxvii, fi;,'. 3. 



IS.'iO. — — A. iVOrh'ujiiij. I'nxlr. dePal., vol. i-i, J.. LW (^«(Wr»i)- 



1854. — —J. Morris. Cat. Brit. Foss., ed. 2, p. 230 (pariivi). 



1868. — — A. Brlart and F. L. Curncf. Meule de Bracquej^uius (Mi'ui. 



cour. et Mi''iii. des Sav. I't rauj,'ers, 

 vol. xxxiv), J). 73, j)l. viii, tif^s. 



y, 10. 

 1870. — — F. Stoliczlca. Pul;ioiit. indica, Cret. Fauna S. India, vol. iii, 



1>. i(;o. 

 1873. — — II. I). Ociiiitz. Das lilbthalgol>. iu Sachseu (Pala-'outo- 



graphica, vol. xx, pt. 2), p. 65, pi. xviii, 

 figs. 9, 10. 

 ? 1882. — J. Kiesou). Sclirift. d. uat. (Icsellsch. iu Danzig, N.F., vol. v, 



p. 239. 

 !' 1885. — — F. Niilliitij. Die Fauna <1. haltisL-li. Cononian. (I'alx'out. 



Al)liandl., Vol. ii), p. 32, pi. vi, tig. 1. 



Non l.SK). — A. Goldfms. Petrcf. Germ., vol. ii, \<. 217, pi. rli, tig. ('> (P. 



xithfidia, d'Orhigny ). 



— 1843. — — H. D. Gcinitz. Die Versteiu. von Kiesliugswalda, p. 13, pi. ii, 



figs. 7—9. 

 'i — 1845. — ~ A.d'Orhhjinj. Pal. Pranv. Terr. Cret., vol. iii, p t-t-t, pi. 



ccclxx.w, figs. G — 8. 

 1846 — — A. E. Eeusa. Die Verstein. der bohni. Kreideforniat , |.t. 2, 



p. 21, pi. xli, tig. 12. 



— 1847. — — J. Midler. Petref. der Aaehen. Kreidef., pt. 1. p. 24. 



— 1859. — iMMEKSA, Midler. Ibid., Supplement, p. 13. 



— 1863. ^ FABA, A. V. Stromheck. Zeitschr. d. deulsch. geol. Gesellseli., vol. 



XV, p. 147. 



1 Au ira^xji-fect left valve from the Cenomanian (Bed 12) of Wbitecliff, South Devon, was 

 identified by C. J. A. Meyer with Veiiiig Goldfiisxi. Geinitz, ' Das Quadersaudst. oder Kreidegeb. iu 

 Deutschland ' (185U), p. 154, pi. x. figs. 7, 8 ; ' Das Elbthalgeb. iu Saehseu ' (' Palueoutogi-aphicu,' vol. 

 XX, pt. 2, 1873), p. 67, pi. xviii, figs. 16, 17. There is not sulficieut evidence to confirm this ideutificu- 

 tion ; the anterior part of tlie specimen is more produced than in the case of the examples figured by 

 Geinitz. 



