TRIGONTA. 87 
21885. Triconta spinosa, EF’. Notling. Die Fauna d. baltisch. Cenoman. (Palont. 
Abhandl., vol. 11), p. 27, pl. iv, figs. 16, 17. 
F Non 1837, — — F. Dujardin. Mém. Soe. géol. France, vol. ii, p. 224. 
— 1844. — — A. @Orbigny. Pal. Franc. Terr. Crét., vol. iii, p. 154, 
pl. cexevii, figs. 1—5. 
— 1850. _— o POrbigny. Prodr. de Pal., vol. ii, p. 161. 
Types.—The type, from Blackdown, and the specimen figured by Sowerby, are 
in the British Museum. 
The originals of Lycett’s pl. xxi, fig. 10, and pl. xxviii, fig. 1, 2, are in the 
Museum of Practical Geology; of pl. xxiv, fig. 8,in the Wiltshire Collection, Wood- 
wardian Museum; of pl. xxiv, fig. 9, in the Williamson Collection, Manchester 
Musewn. 
Distribution.—Greensand of Blackdown. 
Triconia Vicaryana, Lycett, 1875. 
1844. Tricon1a spinosa, A. d’Orbigny. Pal. Frang. Terr. Crét., vol. iii, p. 154, 
pl. cexevil, figs. 1—5 (non 1. spinosa, Park.). 
1850. —_ ms @’ Orbigny. Prodr. de Pal., vol. ii, p. 161. 
1867. — — E. Guéranger. Album Paléont. de la Sarthe, p. 14, 
pl. xviii, fig. 2. 
1875. = Vicaryana, Lycett, pp. 141, 203, pl. xxiii, fig. 7; pl. xxv, figs. 
8, 9; pl. xxviii, fig. 4; pl. xl, figs. 3, 4. 
? 1882. psEuDospinosa, P. de Loriol. Gault de Cosne (Mém. Soe. Pal. 
Suisse, vol. ix), p. 99, pl. xii, figs. 12 
—14. 
1896. _— Vicaryana, A. J. Jukes-Browne and W. Hill. Quart. Journ. 
Geol. Soe., vol. li, p. 154. 
Remarks.—This is relatively higher and shorter than 7, Arehiaciana, dV Orbigny, 
T. upwarensis, Lycett, and 7’. ornatu, VOrbigny. The costelle on the area are more 
oblique to the carina than in 7. upiwarensis. The costee are more numerous than 
in 1’, ornata. 
1. Ludovice, Briart and Cornet,’ from Bracquegnies, is more produced pos- 
teriorly, it has fewer ribs anteriorly, and closer ribs posteriorly, than T. Viewryana. 
De Loriol figures a form from the Gault of Cosne, which he regards as 7. 
spinosa, VOrbigny, ow Sowerby, and names 7. pseudospinosu, but it seems to 
possess fewer and stronger costelle on the area than 7’. spinosa, d’Orbigny, which 
is here considered to be identical with 7) Viewryana, Lycett. 
Types.—F rom the Greensand near Sidmouth and Haldon; in the Museum of 
Practical Geology (Lycett’s pl. xxv, fig. 8), and Mr. Vicary’s collection (fig. 9). 
' «Descript. de la Meule de Bracquegnies’ (1868), p. 65, pl. vi, figs. 6, 7. 
