2 4 — 



with its rami long and distally curved somewhat forwards, 

 and with a thin spine originating at the base of the inner 



ramus ; the proximal process conspicuously expanded 

 beyond the middle on its inner side and here with some 

 more or less distinct fine saw-teeth, while it distally tapers 

 to the acute end. — The species is small, only 9-12 mm. 

 West Atlantic, Cap Verde. 



Group b. Species ivith a single (rarely no) pair of 

 lateral denticles on the carapace. No dorsal process 

 011 third to fifth abdominal segment. 



Five species have been described : E. superba Dana, 

 E. tenera H. J. H., E. similis G. O. S., E. crystalloro- 

 phias Holt, and Tatt. and E. lucens H. J. H. Two new 

 species are added here : E. pacifica n. sp. and E. frigida 

 n. sp., and a variety of E. Vallentini Stebb. must be men- 

 tioned. 



As to the antarctic species E. superba Dana and E. 

 crystallorophias Holt, and Tatt. the reader is referred to 

 Tattersall (77), while E. tenera H. J. H. (= E. gracilis 

 G. O. S., not Dana) has been dealt with in the « Siboga » 

 report. But the other species must be treated here. 



E. similis G. O. S. — This species has been described 

 by Sars (16) ; in the « Siboga » report a few corrections 

 were stated together with a special description of the 

 antennulae which afford excellent characters ; furthermore 

 the anomalous vaulting and shape of the gastric area and 



Fig. 6. Euphausia 

 americana n. sp. 

 Distal part of the 

 inner lobe of left 

 copulatory organ, 

 from behind, p 2 . 

 terminal process; 

 p 3 . proximal pro- 

 cess. 



