f . Inner distal angle on upper side of second anten- 

 nular joint with a spine which is somewhat or 

 much longer than the tubercle on the outer angle. 

 Leaflet on first antennular joint in the maie long, 

 oblong triangular and much recurved, in the female 

 vertical or a little recurved with the distal margin 

 rather deeply concave E. reairpa, n. sp. 



ff . Inner and outer distal angles on the upper side 

 of second antennular joint similarly shaped, either 

 obtuse or with a rather low conical tubercle. Leaflet 

 on first antennular joint similar in both sexes, 

 directed obliquely upwards and forwards, rather 

 small and distally bifid E. mutica, n. sp. 



g. Front part of the carapace somewhat produced, trian- 

 gular, with the front angle measuring less than 90 0 ; 

 rostrum obsolète or very short, narrow. Outer angle 

 on the upper side of second antennular joint with a 

 conspicuous spiniform process; inner angle obtuse. . 



E. brevis, n. sp. 



B. Front part of carapace proximally much expanded, over- 

 lapping almost totally the eye-stalks. (Rostrum obsolète) . . . 



E. diomedeœ, Ortm. 



In this conspectus and in the following descriptions it is 

 seen that the leaflet on first and the armature of second antennu- 

 lar joint must be carefully examined. Seen vertically from above 

 or from the side the exact shape of thèse parts can not be made 

 out; I may recommend to take the animal between two fingers 

 oftheleft hand, a good pocket-lens between two fingers of the 

 right hand, and examine the parts in question obliquely from 

 in front while the distal part of the antennulse is bent somewhat 

 downwards by the third finger of the right hand. 



Euphausia Mulleri, Claus 



Eiiphausia Mulleri, Claus, Zeitschr. wiss. Zool.Vol. xm,i863, 

 p. 444, Pis. xxviii-xxix, figs. 29-45. 



(42) 



