TRIGONIA. &5 
Redcliff, near Sandown. Ferruginous Sands of Shanklin. Hythe Beds of Hythe, 
etc. Atherfield Beds of Sevenoaks. Lower Greensand of Seend (side Lycett). 
Sandgate Beds of Parham Park. 
Triconta ornata, @’ Orbigny, 1844. Plate XIX, fig. 13. 
Additional Synonymy. 
£1855. Trreonta ornara, G. Cotteau. Moll. Foss. de ’Youne, p. 76. 
? 1858. — — J. Vilanova-y-Piera. Mém. Geogr.-agric. de Castellon, 
pl. ii, fig. 14. 
P1865. —_— —  H. Coquand. Mon. Aptien de l’Espagne, p. 137. 
1866. —~ —_ F. J. Pictet and G. Campiche. Foss. Terr. Crét. Ste. 
Croix (Matcér. Pal. Suisse, ser. 4), pp. 373, 385. 
1867. oo — PP. de Loriol. In A. Favre, Rech. géol. dans Savoie, 
etc., vol. i, p. 379, pl. c, fig. 8. 
? 1871. _ — W. A. Ooster and C. v. Fischer-Ooster. Protoz. Helvet., 
vol. ii, p. 101, pl. xv, fig. 18. 
1875. — — Lycett, p. 139, pl. xxiv, figs. 6, 7. 
1884. -- sp. indet. (2nd), O. Weerth. Die Fauna Neocom. im Teuto- 
burg. Walde (Paleont. Abhandl., vol. ii), 
pp: 45, 46, 
1896. -= ornata, A. Wollemann. Zeitschr. d. deutsch. geol. Gesellsch., 
vol. xlviii, p. 847. 
21899. — — G. Maas. Ibid., vol. li, p. 248. 
1900. — — A. Wollemann. Die Biv. u. Gastrop. d. deutsch. u. 
holland. Neoe. (Abhandl. d. k. preussisch. geol. 
- Land., N. F., pt. 31), p. 88. 
Remarks.—The English specimens agree better with the example figured by 
Pictet and Renevier than with the type, in which the coste are less numerous. A 
specimen from Lympne (Plate XIX, fig. 15) possesses fewer cost than the exam- 
ples found at Atherfield, and in this character, as also in general shape, it 
approaches more nearly the foreign examples. 
The specimen from Shorncliffe, figured by Sowerby’ as 7. spinosa, var., has 
been regarded by several authors as 7. Archiaciana, @Orbigny ; but I think it is 
more likely to be an example of 7. ornata. I have not been able to trace the 
specimen. 
T'ypes.—The specimens figured by Lycett are in the Museum of Practical 
Geology. 
Distribution —Perna-bed of Atherfield. Ferruginous Sands of Shanklin. 
Hythe Beds of Hythe, Lympne, and near Maidstone. 
1 «Trans. Geol. Soc.,’ ser. 2, vol. iv (1836), pp. 131, 338, pl. xiii, fig. 3. 
