ie: CRETACEOUS LAMELLIBRANCHIA. 
Remarks.—From Agassiz’ figures alone it would be difficult to feel sure of the 
identity of the English form, described by Seeley as 7. hunstantonensis, with 
T. scapha, Agassiz; but the figures of Pictet and Campiche give a much better 
idea of the characters of the species. Seeley’s figure is more accurate than 
Lycett’s, but the arrangement of the tubercles is not satisfactorily shown. 
Types.—The type of 7. scapha is from the Neocomian near Neuchatel. The 
type of 7. hunstantonensis is in the Woodwardian Museum ; it was at first stated to 
come from the Red Chalk, but the matrix differs entirely from the Red Chalk, 
and the specimen in all probability is from the Snettisham Ironstone nodules! 
(Lower Greensand), West Norfolk. 
Distribution.—Snettisham Ironstone of Sandringham Warren and Wolferton 
Station. Snettisham Clay of Heacham and Snettisham. The records of this 
species from the Red Chalk of Hunstanton are probably erroneous. 
TRIGONIA EXALTATA, Lycett, 1877. 
1877. Lycett, p. 184, pl. xxxviii, fig. 2. 
Type.—In the British Museum. 
listribution.—Lower Greensand of West Norfolk. 
Triconta Roprnanpina ? @ Orbigny, 1844. 
1844. Triconia Rosinaupina, 4. d’Orbigny. Pal. Franc. Terr. Crét., vol. iii, 
p. 189, pl. cexcix, figs. 1, 2. 
1850. — — — Prodr. de Pal., vol. ii, p. 78. 
1866. F. J. Pictet and G. Campiche. Foss. Terr. Crt. 
Ste. Croix (Matcér. Pal. Suisse, ser. 4), p. 385. 
An internal cast from the Tealby Limestone (zone of Bel. brunsvicensis) of 
Claxby, now in the Woodwardian Museum, probably belongs to this species. 
' See Lamplugh, in Whitaker and Jukes-Browne, ‘“ Geol. Borders of the Wash” (‘Mem. Geol. 
Survey,’ 1899), p. 16, ete. 
