156 CRETACEOUS LAMELLIBRANCHIA. 



Pecten (Cami'toxXeotks) Cuttaldinus, tVOrhiijiiij, 1847. Tlato XXIX, fig-.s, 1, 2 a, h, 



3 a, h. 



181-5. Pecten circularis, E. Forhes. Quart. Jouru. Geol. Soc, vol. i, p. 249 



(non Groldfuss). 

 1847. — CoTTALDiNus, A. (VOrUijnij. Pal. Fran^. Terr. Crct., vol. iii, 



p. 590, pi. ccccxxxi, figs. 7 — 11. 

 1850. — — — Prodr. de Pal., vol. ii, p. 83. 



1855. — — G. Cofteau. Moll. Foss. de rYonne, p. 115. 



1861. — — P. de Loriol. Auiiu. Invert, Foss. Mt. Salcve, 



p. 10.3, pi. xiii, fig. 3. 

 1868. — — F. J. Field. Melanges Pak'ont., pt. 4, p. 261, pi. xl, 



figs. 6, 7. 



— — — E. Elchwald. LethEBa Eossica, vol. ii, p. 481. 

 1870. — — F. J. Fictet and G. Campiche. Foss. Terr. Cret. 



Ste. Croix (Mater. Pal. Suisse, ser. 5), 

 pp. 197, 212, pi. clxvii, fig. 3. 

 ? 1871. — — W. A. Ooster. Protozoe Helvetica, vol. ii, pp. 105, 



125, 141. 



— — (Syncyclonema) Cottxi,t>invs, F. StoliczJca. Palaeout. ludica, Cret. 



Fauna S. India, vol. iii, p. 428. 

 1900. — CoTTALDiNus, G. Midler. Verstein. d. Jura u. d. Kreide. In W. 



Bornhardt, Zur Oberflaclien u. Geol. 

 Deiitsch. - Af rikas (Deutscli - Ost- 

 Afrika, vol. vii), p. 551. 



Non 1895, — — Cr. Maas. Zeitsclir. d. deutsch. geol. Gesellsch., 



vol. xlvii, p. 269. 



DescrliMon. — Shell ovate, rather higher than long, inequilateral ; antero-dorsal 

 margin slightly concave, and longer than the postero-dorsal, Avhicli is slightly 

 convex. Convexity of valves small. Ears very unequal. 



Right valve slightly convex ; surface almost smooth, ornamented with numerous 

 fine, regular, concentric grooves, which become more closely placed in passing 

 from the umbo io the margin of the valve. The intersjjaces are flat and sometimes 

 produced as slightly projecting laminae next the concentric grooves. Near the 

 umbo the interspaces are crossed by very fine, close-set radial striae. Anterior ear 

 large, produced, with a very deep byssal sinus, and a sulcus near the junction of 

 the ear and valve ; surface with many concentric narrow ridges. Posterior ear 

 small, triangular, outer angle slightly obtuse, with concentric ornament. 



