116 CRETACEOUS LAMELLIBRA:XCHIA. 



Family— SFO^BYLIDJE, Gray. 



Germs — Spondylus, Linnaeus, 1758. 

 (' Syst. Nat.,' ed. 10, p. 690.) 

 SroNDYLUS RoEMEEi, Dssliayes, 1842. Plate XX, figs. 4 a — d. 



1841. Spondylus kadiatus, F. A. Earner (non Goldfvss). Die Verstein. d. nord- 



deutsch. Kreidegeb., p. 60. 



1842. — LATUS, G. P. Deshayes (non Sou-erhy), in A. Leymerie. Mem. 



Soc. gcol. de France, vol. t, 

 pp. 10, 27, pi. vi, fig. 7. 

 — — EoEMERi, Beshayes. Ibid., pp. 10, 27, pi. vi, figs. 8 — 10. 



1847. — — ^. d'Orbigny. Pal. rrau9. Terr. Cret., vol. iii, p. 655, 



pi. ccccli, figs. 1 — 6. 

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



1855. — — G. Cotteau. Moll. Foss. de I'Yonne, p. 118. 



1861. — — P. de Loriol. Anim. Invert. Foss. du Mt. Saleve, 



p. 107, pi. xiv, figs. 4, 5. 

 1870. — —F.J. Pidet and G. Campiche. Foss. Terr. Cri't. Ste. 



Croix (Mater. Pal. Suisse, ser. 5), pp. 256, 260. 

 ? 1871. — — W. A. Oosfer. Pteropodenschicht Schweizer-Alpen 



(Protozoe Helvetica, 2), pp. 126, 

 141, pi. xviii, figs. 8—10. 

 1883. — — W. Keeping. Foss., etc., Neoc. Upware and Brickhill, 



p. 113. 

 1896. -^ — A. WoUemann. Zeitschr. d. deutsch. geol. Gesellsch., 



vol. xlviii, p. 834. 

 1000. — ■ — • WoUemaini. Die Biv. u. Gastrop. d. deutsch. u. 



liolliiud. Neoc. (Abhandl. d. k. preuss. 

 geol. Jiand., n. F., pt. 31), p. 20. 



Description. — Shell oval in outline, the proportion of length to height vai-iable, 

 more or less oblique. Right valve flattened, with numerous radial ribs, usually 

 faintly marked, and strong concentric lamellfe. Left valve convex, with numerous 

 slightly unequal ribs, separated by grooves of the same width ; the larger ribs 

 occur at regular intervals, and bear spines mostly directed ventrally : between 

 the larger ribs are two or three smaller ribs, either smooth or with small spines. 

 Ears of both valves apparently smooth. 



