190 CONTRIBUTIONS 
seem to have been observed by Lamarck. The figure of 
Brogniart* is much more elevated and rounded at the apex 
than our species. 
L. Duclost.¢ Plate 6. Fig. 208. 
Description. Lunulites slightly convex and cellular 
above, concave and radiate below ; cells in rows diverging 
from the apex and from the sides of other rows ; pores be- 
tween the lines of cells scarcely perceptible. 
Diam. .2, Height nearly .1, of an inch. 
The segment is a magnified view. 
Observations. Goldfuss gives a large figure of the radi- 
ata (Lamarck), which resembles our species. In the 
Duclosii, however, the rows of cells seem disposed to form 
differently, there being one or two rows which are longer 
than the others, and from the sides of which others again 
diverge. Ido not observe the grain of sand in the apex 
of this species ; having but one or two specimens, I have 
not destroyed them for the purpose of examination. 
I am not aware of more than one species of Lunulites 
having been observed in England. The urceolata (Lam- 
arck) ismentioned by Phillips as being found in the Chalk 
of Yorkshire. It is also found at Grignon. Two species 
only have, I believe, heretofore been described, radiata and 
Desc. Geolo. des Environs de Paris, pl. 8, fig. 9. 
| Named after M. Duclos, a distinguished conchologist of Paris, 
a 
