Page:American Seashells (1954).djvu/490

 a. Pacific Thorny Oyster, Spondylus pictorum Schreiber, 5 inches (Gulf of California to Panama), p. 370.

b. Atlantic Thorny Oyster, Spondylus amencanus Hermann 3 to 4 inches. Comes in many colors. Specimen rom the Leo burr) collection. (Florida and the West Indies), p. 369.