Dr. J. P. Moore, University of Pennsylvania 



(Worms) 

 Dr. A. Treadwell, Vassar College (Worms) 

 Mr. E. G. Vanatta, Academy of Natural Sciences 



(Mollnsks) 

 Dr. Waldo L. Schmitt, United States National 



Museum (Crustacea) 

 Dr. Mary J. Rathbun, United States National 



Museum (Decopoda) 

 Mr. Clarence Shoemaker, United States National 



Museum (Amphipoda) 

 Mr. J. 0. Maloney, United States National Museum 



(Isopoda) 

 Dr. H. A. Pilsbry, Academy of Natural Sciences 



(Cirripedia) 

 Dr. Willard G. Van Name, American Museum of 



Natural History (Tunicates) 



While many of the identifications have been 

 checked by these specialists, it has not been possible 

 to have this done in all cases, so the author assumes 

 the responsibility for the identifications used in this 

 book. 



Many of the illustrations are original; others 

 have been borrowed from various sources. The 

 author is especially indebted to the New York Zoo- 

 logical Society, the New Jersey State Museum and 

 the Academy of Natural Sciences of Philadelphia 

 for the loan of certain cuts. 



Photographs of published and unpublished il- 

 lustrations were supplied by the United States 

 National Museum, the American Museum of Natural 

 History, the Connecticut Geological and Natural 

 History Survey (through Dr. W. R. Coe), the 

 Museum of Zoology, Copenhagen, Denmark (through 



