80 CRETACEOUS LAMELLIBRANCHIA. 
TRIGONIA DEDALEA, Parkinson, 1811. 
Additional Synonymy. 
1828. Triconia papaLua, Defrance. Dict. Sciences nat., vol. ly, p. 294. 
8 — — A. Briart and F. L. Cornet. Descript. Mineralog. 
Géol. et Pal. de la Meule de Bracquegnies (Mém. 
cour. et Mem. des Sav. etrangers, vol. xxxiv), 
p- 64, pl. vi, figs. 1—3. 
1875. — — Lycett, p. 100, pl. xxii, figs. 7, 8; pl. xxiii, figs. 2, 3; 
pl. xxviu, fig. 8. 
1875. — — var. conrusa, Lycett, p. 102, pl. xxiii, fig. 1. 
Non 1819. — DHDALEA, Lamarck. Anim. sans Vert., vol. vi, p. 63 (ed. 2, 
1835, p. 516), from Le Mans. 
— 1866. — — FJ. Pictet and G. Campiche. Foss. Terr. Crét. Ste. 
Croix (Matér. Pal. Suisse, ser. 4), p. 371. 
Remarks. 
Lycett regarded 7. palmata, Deshayes,' as a variety of 1’. dedalea ; 
but it should be noted that the former occurs at a distinctly lower horizon than the 
latter, namely, in the Middle Neocomian of the Aube. I have seen no example of 
T. palmata. 
Types.—I have not found the type. The specimens figured by Sowerby are in 
the British Museum; those figured by Lycett are in the Museum of Practical 
Geology, except the type of the variety confusa, which is in Mr. Vicary’s collection. 
The type of 7. quadrata, Sowerby, is in the Bristol Museum. 
Distribution Greensand of Blackdown (Zone xii) and Haldon. 
TRIGONIA sprcraBitis, Sowerby, 1826. 
1875. Lycett, p. 112, pl. xxxvi, figs. 1—4. 
Remarks.—I do not think that Lycett’s view of the identity of the species figured 
by Pictet and Roux’ as 7. nodosa with T. spectabilis can be maintained. In the 
former the area is smaller, the posterior extremity more produced and rounded, the 
tubercles smaller and more rounded and not forming such distinct rows as in 7’. 
spectabilis. 
1 «Mém. Soe. géol. France,’ vol. v (1842), p. 7, pl. viii, fig. 5. 
9 
* «Moll. Foss. Grés verts de Gentve’ (1852), p. 454, pl. xxxv, fig. 5. 
