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U.S. NATIONAL MUSEUM BULLETIN 2 92 



chimneys as high as six inches. In contrast, burrows of the males of 

 U. burgersi, even those in which recent excavations had been made, 

 had no chimneys and the mud seemed simply to have been discarded 

 in a haphazard fashion. 



Since the observer was not aware that a third species of the genus 

 Uca had been obtained until he returned to Washington, nothing 

 can be said about its burrows except that they must have been along- 

 side those of the other two species. 



Uca burgersi was also found in small muddy areas near the mouths 

 of the Salisbury, Mero, and Layou Rivers, and along an unnamed, 

 seldom-flowing stream immediately north of Mero. None of these 



Figure 71. — Male right first pleopods: a, Uca burgersi (carapace length 9.7 mm) from 

 Dominica station 112, pleopod in lateral view; b, denuded terminal portion of same, 

 posterior view; c, same, lateral view; d, same, anterior view; e, U. cumulanta (cl 10.7 mm) 

 from Curasao (C. J. van der Horst), denuded terminal portion, posterior view;/, same, 

 lateral view; g, U. Uptodactyla (cl 6.5 mm) from Bimini (J. H. Welsh), denuded terminal 

 portion, posterior view; h, same, lateral view; i, U, major, specimen shown in figure 72, 

 denuded terminal portion, posterior view; /, same, lateral view. 



