168 U.S. NATIONAL MUSEUM BULLETIN 236 



structure of leg 2, approach E. Jasciatus and E. striatus very closely. 

 Nicholls' material may have been composite. 



Eudactylopus krusadensis Krishnaswamy, 1950 



Eudaclylopus knisadensis Krishnaswamy, 1950, pp. 118-121, figs. 1-2; 1953, p. 69. 



This species is based on three males collected in Kundugal Channel 

 (type locality) off Krusadi Island in the Gulf of Mannar in a night 

 plankton haul. The specimens measured 0.739 mm. and are charac- 

 terized mainly by their striking color pattern. Krishnaswamy's 

 description is very incomplete and the drawings downright bad, 

 especially his drawing of leg 2. The 2nd exopodal segment of leg 1 is 

 figured (and described) with 2 internal setae, which is almost cer- 

 tainly faulty. The (few) principal points from Krishnaswamy's 

 description are recapitulated in his 1953 paper. Unless additional 

 information, especially good drawings of the legs and oral parts, 

 become available, the species must stand as an uncertain species. 



Genus Idomene Philippi, 1843 



I have, for the purpose of stability, accepted Lang's definition 

 of this genus, which now also includes the genera Xouthous Thomson, 

 1822, Idomenella T. Scott, 1906, and Megarthrum Norman and T. 

 Scott, 1906; type species is Idomene forficata Philippi, 1843. 



The following species are now known : 



Females Males 



I. forficata Philippi, 1843 I. forficata Philippi, 1843 



Xouthous novae- zealandiae Thomson, X. novae- zealandiae Thomson, 1882 



1882 

 Dactylopus coronatus T. Scott, 1894 

 D. pectinatiis T. and A. Scott, 1898 



D. antarcticus Giesbrecht, 1902 D. antarcticxis Giesbrecht, 1902 



Dactylophusia laticauda Thompson and 



A. Scott, 1903 

 D. aevnda Thompson and A. Scott, 



1903 

 Dactyloptisia purpurocincta Norman 



and T. Scott, 1905 

 Megarthrum simulans Brady, 1910 

 I. pusilla Brady, 1910 



/. australis Brady, 1910 

 /. borealis G. O. Sars, 1911 

 D.ferrieriT. Scott, 1912 

 /. intermedia Lang, 1934 

 X. maldiviae Sewell, 1940 

 7. scotti Lang, 1948 (7. scotti Lang, 1948) 



The position of the following species is uncertain : 

 7. kabylica Monard, 1936 



