TRIGONIA. 79 



1850. Trigonia rudis, A. d'Orbigny. Prodr. de Pal., vol. ii, p. 78 {fpartim). 

 1854. — NODOSA, /. Morris. Cat. Brit. Foss., ed. 2, p. 229. 



? 1855. — RUDIS, G. Cotfeau. Moll. Foss. de I'Youne, p. 76. 



1857. — D^DALEA, F. J. Pictet and E. Benevier. Foss. Terr. Aptien 



(Mater. Pal. Suisse, sei*. 1), p. 92, pi. xii, 



fig. 1. 

 1857. — NODOSA, Pictet and Benevier. Ibid., p. 94, pi. xii, fig. 2. 



1865. — — H. Coquand. Mon. Aptien de I'Espagne, p. 133. 



1866. — — F. J. Pictet and G. Camjjiche. Foss. Terr. Crct. Ste. 



Croix (Mater. Pal. Suisse, ser. 4), p. 385. 



1875. — — • Lijcett, p. 106, pi. xxv, figs. 1, 2 ; pi. xxxvii, figs. 5, 6. 



1875. — — var. Oebigntana, Lycett. Ibid., p. 107, pi. xxiv, figs. 



1—3. 



1896. — — A. WoUemann. Zeitsclir. d. deutsch. geol. Gesellsch., 



vol. xlviii, p. 846. 



1900. — — — Die Biv. u. Gasti-op. d. deutsch. u. hol- 



liind. Neoc. (Abhaudl. d. k. preus- 

 sisch. geol. Land., N. F., pt. 31), 

 p. 90, pi. iv, fig. 8. 



Non 1862. — — F. J. Pictet and W. Uoux. Moll. Foss. Gres verts de 



Geneve, p. 454, pi. xxxv, fig. 5. 



Bemarls. — There appears to be a perfect passage from the typical T. nodosa to 

 the variety named by Lycett Orhignyana. 



Lycett regarded T. cincta, Agassiz, as a synonym of T. nodosa ; I have seen no 

 examples of the former, but its area appears to be proportionately larger, while the 

 ribs seem to be more nearly perpendicular to the carina and more nearly parallel 

 to the ventral margin than in the English specimens. 



Types. — I have not found the type ; it came from the Hythe Beds of Hythe. 

 The specimens figured by Lycett are in the Museum of Practical Geology. 



JJlstributiou. — Hythe Beds of Hythe and Lympne. Crackers of Atherfield. 

 Per^^a-bed of Atherfield and Redcliff. Folkestone Beds near Copt Point, Folke- 

 stone. Claxby Ironstone of Tealby (fide Lycett). 



Tkigonia tealbyensis, Lycett, 1875. 



1875. Lycett, p. 114, pi. xxviii, fig. 7. 



Type. — In the Woodwardian Museum, Cambridge. 



Distribution. — Spilsby Sandstone (zone of Bel. lateralis) of Claxby. 



