534 



PROCEEDINGS OF THE NATIONAL MUSEUM 



distinction between the two genera and I regard this as a minor, 

 quantitative feature, of no generic vahie. The submergence of 

 Audulla in Eurystheus is recommended. 



The following species are peculiar in that the telson is deeply 

 emarginate: E. Una, E. chiltoni, and E. haswelli. The wide variation 

 of characteristics in Eurystheus, particularly in the gnathopods, sug- 

 gests that such variability of the telson is specifically inconsequential 

 in the genus. On the other hand these may represent cases where 

 only the upper part of the telson has been observed while the lower 

 posterior flap of the telson was not seen or drawn. 



Eurystheus atlanticus (Stebbing), aberrant form 



Figure 29 



Gammaropsis atlantica Stebbing, 1888, p. 1101, pi. 114. 



Gammaropsis zeylanicus Walker, 1904, pp. 282-283, pi. 6, fig. 41; 1909, p. 339. 



Gammaropsis Gardineri Walker, 1905, pp. 929-930, pi. 88, figs. 11-14, 16, 17. 



Eurijstheus atlanticus .—'S>iehhing, 1906, p. 611; 1908, pp. 86-87, pi. 40B; 1910a, 

 p. 461; 1910b, p. 614, 648.— Chilton, 1921, p. 81.— Tattersall, 1922, pp. 10-11, 

 pi. 1, figs. 17-20.— Schellenberg, 1926, pp. 375-376.— Hale, 1927, p. 315.— 

 Chevreux, 1927, pp. 110-111.— Hale, 1929, p. 223, fig. 220.— Chevreux, 1935, 

 p. 126.— K. H. Barnard, 1937, p. 164.— Pirlot, 1938, pp. 345-346.— Raid, 

 1951, p. 258.— Pillai, 1957, pp. 56-57, fig. 14.— RuflFo, 1959, p. 19. 



Materials: Reish stations E-45 (1), E-145 (10). 

 Remarks: Apparently this species is most variable, especially in its 

 eyes, ranging from lageniform to flask-shaped to oval. The type 



Figure 29. — Eurystheus atlanticus (Stebbing), female, 4.5 mm., Reish sta. E-142: a, lateral 

 view; b,c, gnathopod 1; e, gnathopod 2, lateral v\ew,f-h, pereopods 1, 2, 5; i-l, uropods 

 1, 2, 3, 3; m, telson; male, 4 mm.: d, gnathopod 2. 



