242 ZOOLOGY 



Max M. Ellis, Proceedings United States National Museum, Vol. 42, 



page 481, and Vol. 55, page 241. 

 SMITH, FRANK. Proceedings United States National Museum, Vol. 52, page 



157. (North American earthworms.) 



MOORE, J. P. Bulletin United States Bureau of Fisheries, Vol. 25 ; and Pro- 

 ceedings United States National Museum, Vol. 21. (North American 



leeches.) 

 PRATT, H. S. A Manual of the Common Invertebrate Animals, 1916. Pages 



227-322. (Descriptions and figures of the commoner annelids.) 

 SMITH, FRANK, in WARD and WHIFFLE. Fresh-water Biology, 1918, pages 



632-645. (Aquatic earthworms.) 



