VENTRICULITES, 243 
 fungiform ; fig. 7, is the upper part of a specimen, the stem 
having been broken off ; figs. 2 and 4, are examples of the 
lower part of the zoophyte ; in all, there are openings at the 
_ base, and a groove on the margin or edge of the upper part 
_ in which the structure of the inclosed fossil is visible ; upon 
_ breaking these flints, sections of a funnel-shaped body are 
exposed. 
o 
TE 
4 
Hyg] 
iy | 
Lien. 80. FLINTS, DERIVING THEIR FORMS FROM ZOOPHYTES. 
From the South Downs, near Lewes ; 4 nat. 
. Fig. 1.—CHoanirEs (?) TURBINATUS. 
2, 3, 4, 6, 7, 8, 9. -FLinTs, whose forms are derived from VENTRI- 
CULITES, provincially called ‘‘ petrified mushrooms.” 
5.—SPONGITES LABYRINTHICUS. 
10.—SPONGITES FLEXUOSUs. 
The origin of these fossils will be understood by reference 
to the four specimens delineated in Lign. 81. In Sig. 3, a 
fungiform flint, resembling jig. 6, of Lign. 80, is seen in the 
lower part of a cup-shaped zoophyte ; while above, and sur- 
rounding the flint, the impression remains of the reticulated 
outer surface, deeply coloured by a ferruginous tinge. In 
fig. 4, Lign. 81, small turbinated flint, resembling jig. 4, 
of Lign. 80, occupies the base, and three rootlets are seen 
emerging from it ata. In Lign. 82, fig. 1, in which the 
chalk has been removed so as to expose the outer surface of 
the Ventriculite, a flint occupies the centre at ¢; above 
