152 U.S. NATIONAL MUSEUM BULLETIN 236 



The distribution of this species is world-wide, including the Indian, 

 Pacific, and Atlantic Oceans as well as the Arctic and Antarctic regions. 

 To the localities mentioned in Lang's paper the following areas must be 

 added: The Puget Sound beaches in the United States (Wieser, 1959); 

 Oresund Strait between Denmark and Sweden (Dahl, 1948); Whit- 

 stable in Kent, England (Maghraby and Perkins, 1956); the Plymouth 

 area of England (Marine Biological Association, 1931, 1957); the 

 Dalkey area of Dublin County in Ireland (Roe, 1958); Lough Ine of 

 County Cork in Ireland (Roe, 1960) ; Teneriffe in the Canary Islands 

 (Noodt, 1955a); in Posidonia pastures near Portofino, Italy (Gal- 

 lingani, 1952); Rovinj, Yugoslavia, on the Adriatic (Vatova, 1928); 

 Hurghada, Egypt, on the Red Sea (Nicholls, 1944a); Port Denison in 

 Western AustraUa (Nicholls, 1945); and in weed washings from Nan- 

 cowry Harbour in the Nicobar Islands (SeweUs, 1940). 



In the Ifaluk collection the species occurs both in washings of algae 

 (Iocs. 425, 431) and in sand samples (loc 590). 



Genus Eudactylopus A. Scott, 1909 



For the present I have left the genus Neodactylopus Nicholls, 1945, 

 separate from Eudactylopus though the differences are small. The 

 principle difference is the long endopodite of leg 1 (longer than the 

 exopodite) in Eudactylopus and the short endopodite (shorter than the 

 exopodite) in Neodactylopus. There may be additional differences in 

 the structure of maxillule and maxilla, but a clear appreciation of these 

 would involve a reexamination of representatives in both genera; 

 Nicholls' genus is based on a single female specimen. In addition to 

 the type of the genus, Neodactylopus cyclopoides NichoUs, 1945, 

 SeweU's Eudactylopus anomala (Sewell, 1940, p. 219, fig. 40) probably 

 belongs to Neodactylopus. 



The type of the genus Eudactylopus is Dactylopus latipes T. Scott, 

 1894. T. Scott's trivial name, however, is a primary homonym of 

 Dactylopus latipes Boeck, 1864, p. 46 (=Paradactylopodella latipes 

 (Boeck, 1864)); the name, consequently, must be dropped. I have 

 suggested below that it be replaced by Eudactylopus andrewei Sewell, 

 1940. A description of Ifaluk specimens of this species will also be 

 given below. Lang (1948, p. 599) has slightly extended A. Scott's 

 original diagnosis of the genus Eudactylopus which now includes 

 species with 7- to 9-segmented antennules and 1- or 2-segmented 

 antennal exopodite. The number of species recently has increased 

 considerably and, in an effort to review the various species and to con- 

 struct a key for their identification, I have been baffled by the lack of 

 adequate information about several species in spite of lengthy descrip- 

 tions published — e.g., by Sewell. It appears that Sewell, who has 

 contributed to the number of species, attached great importance to 



