NUCULA. 21 



Nuoula ovata, Mantell, 1822. Plate III, figs. 16—18, 19 a, b, 20, 21 a, b; Plate 



IV, figs. 1 a, b. 



1822. Nucula ovata, G. Mantell. Foss. S. Downs, p. 94, pi. xix, figs. 20, 27. 

 1838. — caps-Eformis, H. Michelin. Mem. Soc. Geo!, de France, vol. iii, 



pi. xii, fig. 8, p. 102. 

 1814. — ovata, A. d'Orligny. Pa). Franc. Terr. Oct., vol. iii, p. 173, 



pi. cccii, figs. 1 — 3. 

 1850. — — Prodr. de Pal., vol. ii, p. 137. 



1852. — — F. J. Pictet and W. Roux. Moll. foss. des Gres verts de 



Geneve, p. 173, pi. xxxix, fig. 4. 

 1854. — — J. Morris. Cat. Brit. Foss., ed. 2, p. 217. 



1S66. — — F. J. Pictet and G. Campiche. Foss. du Terr. Cret. des 



Envir. de Ste. Croix (Mater. Pal. Suisse , ser. 4), pt. 3 

 pp. 409, 417, pi. cxxix, fig. 9. 

 1874. — Debancei, F. G. H. Price. Quart. Journ. Geol. Soc, vol. xxx, 



p. 358, pi. xxv, fig. 7. 

 1874. — ovata, Price. Ibid., p. 357, pi. xxv, fig. 6. 

 ? 1878. — — O. Fraas. Aus dem Orient, pt. ii, p. 81. 



1884. — — J. S. Gardner. Quart. Journ. Geol. Soc, vol. xl, p. 125, 



pi. iii, figs. 1—3; pi. iv, figs. 28—30. 

 1884. — capsjefoemis, Gardner. Ibid., p. 127, pi. iii, figs. 4, 5. 



Non 1827. Nucula ovata, S. Nilsson. Petrif. Suecana, p. 16, pi. v, fig. 5. 



— 1829. — J. Phillips. Geol. Torks., pt. 1, pi. ii, fig. 10, p. 122. 



— 1837. — — W. Hisinger. Lethaea Suecica, p. 59, pi. xviii, fig. 7. 



— 1846. — — A. F. Reuss. Die Verstein. der bohin. Kreideformat., pt. 2, 



p. 8, pi. xxxiv, fig. 25. 



— lfe>S9. — — 0. Griepenkerl. Die Verstein. der Senon. Kreide von 



Konigslutter (Palaeont. Abhandl., 

 vol. iv), p. 56. 



— 1893. — — A. Fritsch. Stud, im Geb. der b6hm. Kreideformat. 



v. Priesener Schichten, p. 92, fig. 103. 



— 1S97. — — A. Hennig. Revision af Lamellibr. i Nilsson's ' Petrifacta 



Suecana,' p. 03, pi. iii, fig. 21. 



Description. — Shell oblong or ovate-oblong, short posteriorly, compressed, 

 with a slight constriction near the margin opposite the umbo; central part of the 

 ventral margin straight and nearly parallel to the dorsal ; anterior margin 

 rounded, forming an obtuse angle with the dorsal; posterior margin slightly 

 angular, but sometimes somewhat rounded. Umbones not much curved. A 

 slight depression usually extends from near the umbo to just below the posterior 

 angle, giving a slight sinuosity to the margin at that point. Lunule ovate, not 

 much depressed, sometimes ill-defined. Surface smooth, but with lines of 

 growth ; and in a few cases faint indications of radial ribs, seen chiefly near the 

 middle of the valve. Margins smooth. Adductor impressions shallow. 



