334 



The Ohio Naturalist. 



[Vol. Vlir, 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 by 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, 

 Nympkaea advena, 

 Nelumbo lutea. 

 Principal Species: Pontederia cordata, 



Utricular ia vulgaris, 

 Zizania aquatic a. 

 Secondary Species: 

 Potamogeton natans, 

 Potamogeton pusillus, 

 Myriophyllum spicatum,, 

 Sagittaria lati folia, 

 Naias flexilis, 

 Typha angustifolia, 

 Batrachium longirostris. 



Potamogeton lonchites, 

 Bidens beckii, 

 Philotria canadensis, 

 Sagittaria graminea, 

 Typha lati folia, 

 Ph ragm ites ph ragmites , 



Fig. 18. The NympJmca advena C'onsocies, 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. 



