334 
The Ohio Naturalist. 
[Vol. VIII, No. 6, 
in the course of time to build up the bottom to such an extent 
as to eventually lead to the invasion and occupation of the 
habitat bv the formation to be next described. 
The Castalia-Nymphaea Formation. 
This formation also is well developed in the Cedar Point 
coves. It occupies a zone next outside of the Potamogeton For¬ 
mation in water of a depth of from one or one-and-one-half feet 
to four feet. In its outer deeper part it is always much mixed 
with the Potamogeton Formation but aside from that it is a well 
defined and vigorous structure. 
Facies: Castalia tuberosa, 
Nymphaea advena, 
Nelumbo lutea. 
Principal Species: Pontederia cordata, 
Utricularia vulgaris, 
Zizania aquatica. 
Secondary Species: 
Potamogeton natans, 
Potamogeton pusillus, 
Myriophyllum spicatum 
Sagittaria latifolia, 
Naias flexilis, 
Typha angustifolia, 
B atra chium Ion giro st ris. 
Potamogeton lonchites, 
Bidens beckii, 
Philotria canadensis, 
Sagittaria graminea, 
Typha latifolia, 
Phragmites phragmites 
Fig. 18. The Xymphaea advena Consocies, here mingled with the Cas¬ 
talia tuberosa Consocies, in the second cove south of Biemiller’s Cove. 
Typha in the immediate background and Phragmites farther back. 
