4 The American Naturalist. [January, 



northern extremity of the island ; over this point the wind 

 sweeps with great force, carrying the sand mixed with frag- 

 ments of shells, Helix ayresiana, marine shells and other debris 

 from the rancherias, &c. 



The sand beach forming around Cuylers Harbor, above re- 

 ferred to, is composed of sand with a large proportion of frag- 

 ments of the land shell, and a small proportion of those of 

 marine origin. 

 Santa Barbara, California, 

 August 16th, 1891. 



