On The Structure And Function Of The Sphaeridia Of The Echinoidea is a scientific book written by Howard Ayers in 1885. The book focuses on the anatomy and physiology of the sphaeridia, which are small, spherical organs found in sea urchins and other echinoderms. Ayers provides a detailed description of the structure and function of these organs, including their role in the reproductive process and the circulation of fluids within the body of the...