232 THE MEDALS OF CREATION. Cuar. VII. 
forms that are allied in structure to the Siphonie. These i 
fossils present considerable diversity of shape ; one of the lobed — 
ON forms is delineated in Lign. — 
ti j)* =) ) . 3 
OA <, Vad \ a 73, fig. 4: and a branched — 
haa i \ ¢ ys species in Lign. 74. Upon — 
ym *7 breaking the stem of one of © 
| Way "| these zoophytes transversely, © 
Woe WWI Wy, 1 Sectionsof parallellongitudinal - 
7) BMEBNYY ( / tubes like those in the Sipho- 
niz are exhibited. 
x“ Fk The Kentish rag contains 
N IN irregular ramose spongeous 
SS tS ‘ . ror 
\ bodies, which belong to’ this — 
eS group of porifera ; and Mr. — 
Bensted has discovered in his — 
quarry, near Maidstone, nu- — 
h 
merous remains of a polymor- 
a) 
KP OPT) 
YUM M Miies fb fr! 
4 phous lobed zoophyte, having — 
: a porous structure beset with — 
Peers. spicula. In the Firestone of E 
PoLXYPOTHECIA DICHOTOMA, Southbourn, Steyning, and — 
—-_ 
Upper Greensand, Warminster, Wilts. Bignor, in Sussex, I have ob- 
served large pyriform and subcylindrical Siphoniee. 
The organization of all these zoophytes was evidently — 
adapted for the imbibition and circulation of sea-water, in a 
more perfect and definite manner than in the irregular simple — 
sponges. j 
Flint-pebbles inclosing remains of Siphonize abound on 
the Sussex coast, especially in the shingle near Brighton, ~ 
having been washed out of the chalk cliffs. There were 
several chalk-pits in Edward-street, (now, I believe, filled % 
up and the area built upon,) in which every flint enveloped ; 
a sponge or siphonia ; many specimens were mineralized by 
pyrites and beautifully exhibited the internal structure of 
the originals. 
ae a 
