CARDIUM. 203 



Cakdium Cuttaldinum, d'Orbigny, 1844. Plate XXXII, fig. 11 a — e. 



1844. Caeditjm Cottaldinum, A. d'Orbigny. Pal. Franc. Terr. Oct., vol. iii, 



p. 22, pi. ccxlii, figs. 1 — 4. 



1850. d'Orbigny. Prodr. de Pal., vol. ii, p. 79. 



1866. F. J. Field and G. Campiche. Terr. Oct. Ste. 



Croix (Mater. Pal. Suisse, ser. 4), 

 p. 246, pi. cxviii, figs. 1, 2. 



1871. F. Stuliczka. Palaeont. Indica, Cret. Fauna S. 



Iudia, vol. iii, p. 212. 



1883. W. Keepiiuj. Foss., etc., Neoc. Upware and Brick- 



bill, p. 118, pi. vi, fig. 4. 



1884. 0. Weerth. Die Fauna des Neocom. irti Teutoburg. 



Walde (Pabeont. Abbaudb, vol. ii), 

 p. 44, pi. ix, fig. 3. 

 Oerlinghusanum, Weerth. Ibid., p. 44, pi. ix, fig. 4. 

 1895. Cottaldinum, 0. Maas. Zeitscbr. der deutscb. geol. Gresellsch., 



vol. xlvii, p. 263, pi. vii, figs. 2, 3. 

 1900. A. Wollematiu. Die Biv. u. Gastrop. d. deutscb. u. 



holland. Neocoms (Abbandl. d. 

 k. preussisch. geol. Land., n. f., 

 pt. 31), p. 107. 



Description. — Shell oval, inflated, slightly inequilateral, rather higher than long. 



Anterior and ventral margins rounded. Posterior margin more or less truncated. 



Umbones rather high, sharp, curved inward and forward, with an indistinct carina. 



Ornamentation consists of numerous, small, regular, radial ribs, which are 



rather more prominent on the posterior area than on the sides of the shell. 



Measurements : 



Length .... 24 mm. 



Height .... 255 „ 



Upware. 



Affinities. — This species closely resembles G. Ibbetsoni, but differs in having the 

 posterior area less flattened and the outline of the shell more rounded. The 

 English specimens of 0. Cottaldinum are larger than those of G. Ibbetsoni, but are 

 not sufficiently numerous or well-preserved for exact comparison. 



In G. Cottaldinum the shell is relatively higher than in G. Voltzi, Leymerie. 1 



G. landeroiiense, de Loriol, 2 appears to be closely related to G. Gottaldinum. 



Type. — D'Orbigny's specimens came from the Neocomian of Wassy (Haute- 



1 For references see Pictet and Campicbe, ' Terr. Cret. Ste. Croix ' (' Mater. Pal. Suisse,' ser. 4, 

 1866), p. 247. 



- P. de Loriol and V. Grillicron, - Urgonien Infer, de Landeron ' (1869), p. 14, pi. i, fig. 12. 



