THE MERMAID'S WINEGLASS, Acetabulum crenulatum, an exquisite green seaweed, photo- 

 graphed (natural size) soon after being taken from the waters of Biscayne Bay at Miami, Florida. 

 This dainty plant is of occasional occurrence in shallow bays of Bermuda, southern Florida, and the 

 West Indian islands. In Biscayne Bay it sometimes covers areas of considerable size to the exclusion 

 of nearly all other kinds of marine vegetation. The elegant, radiately chambered cups are bright green 

 when living, but they have a delicate coating of lime and they usually become chalky white soon after 

 being gathered 



