- 3 4 - 



First aiitennular joint produced in a rather short, deeply 

 bifid lobe, with its two acute teeth directed upwards and 

 more outwards than forwards. Second joint with the 



upper terminal margin at the outer 

 side produced in a small angle or 

 tooth ; third joint, seen from the 

 outer side, with the dorsal keel 

 somewhat more than half as long 

 as the joint, moderately high, ter- 

 minating in a minute, acute den- 

 ticle. Third abdominal segment 

 has a dorsal, strong, compressed 

 process with the upper margin 

 somewhat convex and the lower 

 straight. The copulatory organs 

 (Fig. 12) show several peculia- 

 rities ; the terminal process has 

 its most distal part flattened, so- 

 mewhat expanded and curved 

 inwards ; the proximal process 

 is nearly semicircularly curved, 

 with its most distal part directed inwards and much 

 expanded, forming a curiously bent plate with a con- 

 spicuous, slender tooth at the base; the lateral process — 

 as in E. gibboides — without tooth, and a minute, spini- 

 form additional process is present. — Length i8-22 mm . 

 East Pacific. 



It may be mentioned that Sars' figures and description 

 differ in several particulars from his type which agrees 

 with my specimens. 



Fig. 12. Euphausia mucro- 

 nata G. O. S. Inner and 

 median lobe of left copu- 

 latory organ, from behind. 

 p~. terminal process ; p'-K 

 proximal process; p' 1 . late- 

 ral process. 



