TRIGONTA. 83 
1835. TrIGcontA cRENULATA, Lamarck. Ibid., ed. 2, vol. vi, p. 515. 
1840. -- —- L. Agassiz. tudes crit. Moll. Foss. (Trigon.), p. 32, 
pl. vi, figs. 4—6. 
1844, — — A. @Orbigny. Pal. Frane. Terr. Crét., vol. iii, p. 151, 
pl. cexev. 
1848. Lyrropon crenuxatus, H. G. Bronn. Index Palxont., vol. i, p. 186. 
1850. ‘T'rrconta crenunata, A. d’Orbigny. Prodr. de Pal., vol. ii, p. 161. 
1866. -— — F. J. Pictet and G. Campiche. Foss. Terr. Crét. Ste. 
Croix (Matér. Pal. Suisse, ser. 4), p. 388. 
1867. -= — I. Guéranger. Album Paléont. de la Sarthe, p. 14, 
pl. xviii, figs. 3, 4. 
? 1878. —- —_ O. Fraas. Aus dem Orient., vol. ii, Geol. Beobacht. 
Libanon, p. 70. 
1896. — — A. J. Jukes-Browne and W. Hill. Quart. Journ. 
Geol. Soe., vol. lii, p. 154. 
Remarl:s.—I have seen only one English example of this. The surface is not 
quite perfectly preserved, so that the rugose character of the costze is not well seen. 
T'ype-—From the Cenomanian of Le Mans. 
Distribution —Cenomanian (Meyer's Bed 10) of Dunscombe. 
Tricgonta antrormis, Parkinson, 1811. 
Additional Synonymy. 
1828. Trriconra ALEForMIS, Defrance. Dict. Sciences nat., vol. lv, p. 297. 
1850. — ALIFormis, G. P. Deshayes. Traité Elément. Couch., vol. ii, 
p. 258, pl. xxxii, fig. 3. 
? 1865. _ _ H. Coquand. Mon. Aptien de l’Espagne, p. 134. 
¥ 1866. “= — F. J. Pictet and G. Campiche. Foss. Terr. Crét. Ste. 
Croix (Matér. Pal. Suisse, ser. 4), pp. 377, 
386, pl. cxxviul, fig. 9. 
1875. — — Lycett, p. 116, pl. xxv, figs. 83—6 ; pl. xxviii, fig. 5. 
1897. = — R. B. Newton. Proce. Dorset Nat. Hist. and Antiq. 
Field Club, vol. xviii, p. 95, pl. 1, fig. 14. 
Non 1841. — AL@Formis, FI’. A. Riimer. Die Verstein. des nord-deutsch. 
Kreidegeb., p. 68. 
= 1848" == — H. B. Geinitz. Die Verstein. von Kieslingswalda, 
p. 14, pl. ii, figs. 15, 16. 
— ?1846. — — A. FE. Reuss. Die Verstein. der bohm. Kreide- 
format., pt. 2, p. 5. 
— 1847. — J. Miller. Mon. Petref. der Aachen. Kreideformat., 
pt. 1, p. 15. 
— 1863, — ALIForMis, R. Drescher. Zeitschr. d. deutsch. geol. Gesellsch., 
vol. xv, p. 348. 
