614 "THETIS SCIENTIFIC EESULT.S. 



EURYSTHEUS ;ATLANTICUS (Stebbing). 

 Stations 28, 35, 37, 44, 57. 



Gammaropsis atlantica, Stebbing, Chall. Rep., Zool., xxix., 1888, 



p. 1101, pi. cxiv. 

 Eurystheus atlanticus, Stebbing, Das Tierreich, xxi,, 1906, p.611. 

 Eurystheus atlanticus, Stebbing, Ann. S. African Mus., vi.. 



Crust., 4, 1908, p. 86, pi. xIb. 



This small, widely distributed species is distinguished by its 

 lageniform eyes. In the second gnathopods the hind margin of 

 the sixth joint is flat and long, especially in the male, which has 

 the defining tooth of the palm stronger than that of the female. 

 In the Australian form, from Station 44, the oblique palm of the 

 male differs to a slight extent from that which I have figured 

 for the South African form, the part near the finger hinge being 

 divided into three triangular teeth. In the general shape of the 

 hand, the cavity occupied by a palmar spine, and in the rather 

 short massive finger, the two forms are in agreement. But the 

 Australian variety exhibits in the male, not in the female, a 

 fringing of very long setse on the front border of the hand, and 

 also of the second joint. Such furniture, however, is probably of 

 an easily detachable character. A specimen from Station 57 has 

 second gnathopods agreeing closely with the African form, the 

 hand very powerful, yet with a more slender finger, which has a 

 slight projection of its inner margin near the hinge. Length 

 about 7 mm. 



Localities. — Manning River ; off Port Hacking ; Botany Bay, 

 50-52 fathoms ; off Coogee, and off Wata Mooli, 54-59 fathoms, 



EURYSTHEUS THOMSONI {Stebbing). 



Stations 37, 57. 



Gammaropsis thomsoni, Stebbing, Chall. Rep., Zool., xxix., 1888, 



p. 1103, pi. cxv. 

 Eurystheus thomsoni, Stebbing, Das Tierreich, xxi., 1906, p. 613, 



fig. 106. 



The present species was originally described from a single 

 specimen, a female, taken by the " Challenger " Expedition off 

 New Zealand. The male has now come to light. Ifc was the 

 only one of the specimens carrying an unbroken upper antenna, 

 which showed a secondary flagellum of the character usual in the 

 genus. Over anxiety to secure this in a preparation mounted 

 for the microscope resulted in its mysterious disappearance. The 



