APPENDIX 483 



Kellogg, J. L. — Observations on the Life History of the Common 

 Clam, Mj'a arenaria. Bulletin of U. S. Fish C'ommission for 

 1899. Government Printing Office. 1900. 



Simpson, G. B. — Anatomy and Phj'siology of Anodonta fluvia- 

 tilus. 35th Annual Report N.Y. State Museum of Natural 

 History. 1884. 



C, A. Kofoid. ~ Plankton of the Illinois River, 1894-1899. Bulle- 

 tin Illinois State Laboratory of Natural History, Vol. VI, 1903 ; 

 Vol. VIII., 1908. 



XVII and XVIII. ECHINODERMS 



A3assiz, A. — North American Starfishes. Memoirs Museum Com- 



par. Zoology, Vol. V. 1877. 

 Ajassiz, A. — Revision of the Echini, Illustrated Catalogue of AIu- 



seum Compar. Zoology, Vol. VII. 1872-73. 

 Clark, H. L. — Synopsis of the Holothuroidca of North America, 



American Naturalist, Vol. XXXV. 1901. 

 Brooks, W. K. — Handbook of Invertebrate Zoology. Boston : 



Cassino. 1SS2. [Excellent chapter on the development of 



Echinoderms.] 



XIX. CCELENTERATES 



Trembley, A. — Memoires pour servir a I'histoire d'un genre de 

 polypes d'eau douce a bras en forme de cornes. Leyden. 1744. 

 [Remarkable first study of Hydra.] 



Agassiz, L. — Acalephs, Ctenophorse, Diseophoras, Hydroid*, in 

 Contributions to the Natural History of the United States. 

 1860, 1862. 



Hargitt, C. W. — Synopsis of the HydromedusiB of North America, 

 American Naturalist, Vol. XXXV. 1901. 



Parker, G. H. — Synopsis of the Actinaria of North America, 

 American Naturalist, Vol. XXXIV. 1900. 



Hyatt, A. — Guides for Science Teaching: III, Commercial and 

 Other Sponges. Heath & Co., Boston. 1893. 



Potts, E. — Synopsis of American Fresh-water Sponges, Proceed- 

 ings Academy of Natural Science of Philadelphia. 1887. 



