WORMS, MOSS-POLYPS, SPONGES, ETC. 119 
Some idea of the vast numbers in which these 
minute organisms occur may be gathered from the 
fact that an ounce of sand taken from the beach of 
Atlantic City, despite the breakages to which the 
minute shells were liable in being tossed and rubbed 
about, was estimated to contain fully 18,000 indi- 
viduals of a single species of Nonionina, and that a 
similar measure taken from the sands of Cape May 
yielded by computation upwards of 38,000 individ- 
uals of the same species. 
