32 ANNUAL REPORT OF THE 



Montreal, and Messrs. R C. Osburn and E. B. Williamson of Co- 

 lumbus, 0. Mrs. Annie T. Slosson has sent Isopoda from Miami, 

 Fla. Material has also been received through exchanges made with 

 the United States National Museum, and M. Henry Coutiere of 

 Paris. At M. Cou tie re's solicitation, our whole collection of Al- 

 pheidae, except a few type specimens too precious to be exposed 

 to the risks of so long a journey, was sent to Paris to be used in 

 monographing the family. They have all been promptly returned, 

 identified by M. Coutiere. Miss M. J. Rathbun of the U. S. National 

 Museum staff, has revised the perplexing group of "Fiddler Crabs" 

 (Uca or Grelasimus), and in this connection has determined all 

 the specimens in this Museum. I have identified the Portunidse 

 (answering to near 480 catalogue numbers), and a good part of the 

 Grapsoid crabs. An article on the Crayfishes in the United States 

 National Museum and the Museum of Comparative Zoology, in- 

 cluding a revision of the Crayfishes of the Southern Hemisphere 

 (the Parastacinse), prepared by me in 1896, has been published 

 this year by the United States National Museum (Proc. U. S. 

 Nat. Mus., Vol. XX. pp. 643-694, PI. 62-70, Feb., 1898). 



