EUPHAUSIA HANSENI r.23 



Antarctic (Terra Nova) Expeditions were found in shallow water in the Ross Sea ;'^ those 

 of the Belgian Expedition from roughly 70° S 82^° W in the Bellingshausen Sea near, 

 if not in, shallow water; those of the Deutsche Siidpolar Expedition from or from very 

 near shallow water off Kaiser Wilhelm Land. 



The species is thus neritic and circumpolar. Single specimens have been found on 

 two occasions far from land, but this must be exceptional: none was found in our 

 stations north of the South Shetlands, nor in those in the Weddell Sea, nor in those 

 nearest to the land on our visits to the ice-edge during the circumpolar cruises in 1932. 



Euphausia hanseni, Zimmer (Figs. 18, 28 o) 

 E. hameni, Zimmer, 1915, pp. 180-2, figs. 38-41; Illig, 1930, p. 503. 



Description. The rostrum is strong and long, reaching as far forward as the front 

 of the eyes or farther, but not so far as the end of the first segment of the antennular 



Fig. 18. E. hausetn. a, carapace and antennular peduncle from the side, x 12. b, left antennular peduncle 

 from above, x 17. c, third to fifth abdominal segments from the side, x 5. 



peduncle (Fig. 18 a). The gastric area of the carapace has a strongly convex keel, easy 

 to see with the naked eye, which runs to and down the rostrum ; there is no notch in 

 this keel as there is in those of E. spinifera and E. longirostris. On either side, behind 

 the upper part of each eye, the anterior margin of the carapace is produced into a 



1 While this paper was in the press the ' Discovery II ' visited the Ross Sea, going as far south as the 

 Barrier (January, 1936). Mr J. W. S. Marr reports that "£. crystallorophias is the dominant euphausian 

 in the neighbourhood of the Barrier and the Victoria Land coast. Dense swarms were seen in the Bay of 

 Whales." He thinks that it may form the food of Minke whales {Balaenoptera acutorostrata, Lacepede) 

 which are abundant in the Ross Sea. 



