6. Marcrensa. (1) Lam. 
Oblong-oyal ; a project- 
ing callous pad on the 
outer lip ; mouth scarcely 
notched at the base: no 
operculum. 
a Spire conical. Pl 11, fig. 20. 
b Spire obscure. Pl. 11, fig 19. 
c Colombella, Lam. 
7. Votvarta. (2) Lam. 
Cylindrical, no appa- 
( 42) 
Columella with folds. 
( Angyostomata.) 
Marine. 
Seas of warm climates, 
principally in the neigh- 
bourhood of the Senegal. 
VY. Animal, p. 69. 
The callous pad of the right lip swelled in the 
middle; folds of the columella numerous. Pl. 11, fig. 17. 
Columella with one or 
rent spire; mouth narrow, several folds at the base. 
as long as the shell. Pl. 14, 
fig. 18. 
B. Columella simple. 
8S.  SrruruHrovaria. 
Lam. 
(3) 
Turreted: 3 undulating 
sinuses. Pl. 12, fig. 9. 
9, Srromeus. (4) Lam. 
Ventricose, with a short 
canal; notched’ or trun- 
cated at the base ; right 
lip dilated in a wing (in 
the adult), with a sinus to- 
wards the base : opercu- 
lum horny, long, narrow. 
Pl. 14, fig. 15. 
10. Terepexium. (5) Lam. 
Oblong or sub-cylin- 
drical ; mouth narrow 
above, simple, enlar2ed 
towards the base, notch- 
ed. Pl. 44, fig. 14. 
(1) Foss. at Grignon. 
(2) Foss. at Grignon. 
Columella covered with 
a plate formed by the left 
lip. 
Columella truncated 
below. 
Ditto. 
Marine. 
Marine. 
Animal unknown. 
Marine. 
Generally in warm 
climates. 
V. Animal, p. 70. 
Marine. 
V. Animal, p. 68. 
(3) The Museum gave 100 francs for the type of this new genus, which is now 
figured for the first time. 
(4) Foss. in the London Clay; at Grignon. 
(5) Foss, at Grignon; Environs of Paris. The Tercebellum perditum (the analo- 
gous living species is not known) is found in great numbers, and of all ages, at 
Grignon. 
