MONOGRAPH OF TlTE GENUS STROPHIA 
too 
> 
Fig. 40. 
Diagrammatic Chart of localities inhabited by species of 
Strophia. A, Hog Island ; B, Long Island ; C, Spruce Key ; D, 
Spotter’s Key; E, a portion of New Providence ; F, Salt Key ; IL 
Nassau Harbor ; N, Narrows ; a, Strophia curtissii (the dotted lines 
indicate boundary limits) ; b, Waterloo ; e. Middle Bay and Strophia 
cinerea ; f, S. c. robusta ; g, S. c. tracta ; h, S. c. mutata ; k, bay, 
near hospital buildings ; i, sand beach ; o, old magazine ; t, Strophia 
thorndikei in the cemetery. The arrows indicate the course of the 
currents at flood tide. 
