CARDIUM. 203 



Cakuium Cottaijunum, (CUrbhjiuj, J 8-14. Plato \XX1I, tig. 11 a — n. 



1844. Cakdium CoTTALDiNUM, A. d' O fhlij II ij . Pal. Frauy. Terr. Civt., vol. iii, 



p. 22, pi. cc.xlii, figs. 1 — 4. 



1850. — — d'OrhUjiiij. Pi-odr. de Pal., vol. ii, p. 79. 



1866. — • — /''. /. Pictet and G. Campiche. Terr. Crut. Stu. 



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

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

 1871. — — F. StoUczka. Palseont. ludica, Cret. Fauna 8. 



India, vol. iii, p. 212. 

 1S83, — — W. Keepimj. Foss., etc., Neoc. Ui^ware and Brick- 



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

 1884. — — O.Weerth. Die Fauna des Neocom. im Teutoburg. 



Walde (Palreout. Abhandl., vol. ii), 

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

 — — Obrlinghusanum, Weerth. Ibid., p. 44, pi. ix, fig. 4. 



1895. — CoTTALDiNDM, G. Matts. Zeitscbr. der deutsch. geol. Gesellsch., 



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

 1900. — — A. Wollemanii. Die Biv. u. Gastrop. d. deutsch. u. 



liolliiud. Neocoms (Abhandl. d. 

 k. preussiseh. geol. Laud., n. f., 

 pt. 31), p. 107. 



Descrlptidii. — Shell oval, inflated, sligiitly iiu'nuilateral, rather higliex" than long. 



Anterior autl 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 riljs, which are 



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



Measurenieiifs : 



Length .... 24' mm. 



Height .... 25"5 „ 



Upware. 



Alfiiiifies. — This species closely resembles C. Iljhctsuiil, Ijut iliffers in having the 

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

 English specimens of G. Cuttaldinuin are larger than those of G. Ibhelsoui, but are 

 not sufficiently numei'ous oi' well-preserved for exact comparison. 



In C. Guttaldinum the shell is relatively higher than in (/'. Voltzi, Leymerie.' 



G. laiideronense, de Loriol," appears to be closely i-elated to G. Guttaldinum. 



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



' For references see Pictet and Campiche, ' Terr. Crct. Ste. Croix ' (' Mater. Pal. Suisse,' ser. 4, 

 1866). p. 247. 



- P. de Loriol aud V. Gillicrou, • Urgouieu luicr. dc Lauderou ' (1869), p. 14, pi. i, fig. 12. 



