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Group d. Species with a single -pair of lateral denticles 

 on the carapace. A well developed dorsal process on 

 third abdominal segment and conspicuous dorsal 

 denticles or processes on fourth and fifth segments. 



This group comprises 3 large and robust species with 

 the rostrum rather long to very long, viz. E. triacantha 

 Holt andTatt., E. spinifera G. O. S. and E. longirostris 

 H. J. H. The following key may be sufficient for the 

 determination ; the three species have been described and 

 figured respectively in the « Challenger » report and in the 

 two papers by Tattersall and myself referred to below. 



a. Posterior margin of third to fifth abdominal segment 

 normal, without incisions and lamellar, triangular 

 protuberances. Lateral denticles of the carapace 

 situated at the low r er margin (Lobe of first antennular 

 joint bifid). E. triacantha Holt and Tatt. 



b. Posterior margin of third to fifth abdominal segment 

 with incisions and lamellar protuberances. Lateral 

 processes of the carapace situated above the lower 

 margin. 



a. Lobe from first antennular joint broad, w T ith the 

 margin irregularly incised and digitate. 



E. spinifera G. O. S. 



ß. Lobe from first antennular joint high, distally rather 

 narrow with the end bifid. E. longirostris H. J. H. 



E. triacantha is known from the Antarctic South-East 

 of New 7 Zealand (Tattersall 77), E. longirostris from the 

 Antarctic South of the Falkland Islands (H. J. Hansen, 5) 

 and both have been taken by the Swedish Antarctic Expe- 

 dition in the area at South Georgia. The Copenhagen 

 Museum possesses specimens of E. spinifera from eleven 

 localities situated in a nearly transverse belt between 

 lat. 32 1/2 0 and 38° S. in the Atlantic and between lat. 38°S. 

 and 4o°5o' S. in the Indian Ocean and the West Pacific, 

 and Sars had it from South of Australia and about midw r ay 



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