io6 



DISCOVERY REPORTS 



Amblyops antarctica sp.n. 

 Occurrence: ^ *>' ' 



St. 1652. 23. i. 36 (day). Bay of Whales, 567 m., 1 imm. $, 13-2 mm. 



St. 1957. 3. ii. 37 (day). South of Clarence I., South Shetlands, 785-810 m., 1 imm. ?, 12-2 mm. Type. 



Remarks. These specimens so closely resemble the description and figures of A. abbreviata (G. 0. 

 Sars in M. Sars, 1869, p. 262), that I was at first inclined to refer them to that species. They do, how- 

 ever, show three differences, which I do not consider to be attributable to their immaturity and these, 

 together with the vast difference in geographical distribution, have convinced me that they do 

 represent a new species. 



Fig. 22. Amblyops antarctica sp.n. A, anterior end of immature female in dorsal view; B, right antennule; C, right antenna; 

 D, endopod of first thoracic appendage with epipod; E, second thoracic appendage; F, right uropod; G, telson. All x 20. 



A. abbreviata has a wide distribution in the northern waters of the northern hemisphere and has 

 been recorded in the North Atlantic, North Pacific and Arctic Oceans. A. antarctica may be dis- 

 tinguished by its broader antennal scale, the shorter broader eyeplates and by the larger, more 

 crowded spines arming the lateral margins of the telson. In A. abbreviata the antennal scale is at least 

 3 \ times as long as broad at its widest part, but in A. antarctica it is less than z\ times as long. In the 

 specimen from station 1652, the small supplementary spine on the inner margin of the terminal spine 

 of the outer margin of the scale, which is characteristic of A. abbreviata, is present and well-developed, 

 but I am unable to find it in the other specimen. The eyeplates are shorter and proportionally broader 

 in this species than in A. abbreviata, but they show precisely the same microscopic spinulation as in 



