184 
The Ohio Naturalist. 
[Vol. X, No. 8, 
Strophitus edentulus (Lea, Anodonta) ? No specimen in mv 
collection, but listed in my notes. 
Anodontoides ferussacianus subcylindraceus Lea.?, one speci- 
men. 
Anodonta grandis Say, one specimen. 
What appeared to be a white specimen of Quadrula coccineus 
Conrad, was found near the Lake Laboratory, and probably 
came from the Sandusky Bay. The balance of these shells 
were picked up on the shore of Lake Erie between Cedar Point 
and the Laboratory. The list is by no means complete, probably 
but simply shows what can be gathered in one season. Several 
species were taken alive. 
XEROPHYTIC ADAPTATIONS OF APOCYNUM 
HYPERICIFOLIUM. 
John H. Schaffner. 
In the January, 1905, Ohio Naturalist, the writer presented 
some observations on the occurrence and development of mat 
plants, showing that some plants which are erect in an ordinary 
environment become prostrate, with radiating branches, when 
growing in exposed situations as on a sandbar or newly plowed 
prairie. While studying the xerophytic vegetation of Cedar 
Point, at Sandusky, Ohio, my attention was called to the pros- 
Fig. 1 . Apocynum hypericifolium growing on a sand blow-out 
on Cedar Point. 
