EUPHAUSIA PACIFIC A. 241 



terranean. The Copenhagen Museum possesses specimens from four locahties 

 in the North Atlantic: — Lat. 37° N., long. 41° W.; Lat. 33° N., long. 47° W.; 

 Lat. 24° N., long. 22° W., and Lat. 23° 31' N., long. 22° 4' W.; furthermore 

 from one place in the South Atlantic: — Lat. 22^° S., long. 29^° W., from one in 

 the Southern part of the Indian Ocean about at Lat. 23° S., long. 81i°E., 

 finally from a place at Japan: — Lat. 31° 20' S., long. 132° 29' E.— Most of the 

 specimens recorded have been taken at the surface. 



Group b. Species ivith a single pair of lateral denticles on the carapace. No 

 dorsal process on third to fifth abdominal segment. 



17. £uphausia pacifica H. J. Hansen. 

 Plate 7, figs. 5a-5b. 



1911. Euphausia pacifica H. J. Hansen, Bull. Mus. Ocdan. Monaco, no. 210, p. 2S (with two figures 

 in the text). 



4 fms., surface net. 1 immature speci- 



Sta. 4571. Oct. 7, 1904. Lat. 33° 40' N., long. 119° 35' W.  



men. 

 300 fms. to surface. 28 immature speci- 

 mens. 



Description. — The frontal plate is extremely short, without any real rostral 

 process, but at the middle feebly produced as a triangle several times broader 

 than long, with the vertex in the adults generally rounded, rarely acute, in 

 immature specimens rounded or acute. 



The eyes are extremely large; the distal joint of the stalks short. — The 

 antennular peduncles are somewhat long, more slender in immature specimens 

 (fig. 5a) than in adults; lobe of first joint is in the adults a small, oblong-triangu- 

 lar, acuminate, and acute process; in specimens a little more than half grown 

 it is somewhat shorter in proportion to breadth (fig. 5b). Second joint is dis- 

 tinctly longer than the third, with the inner distal angle on the upper surface a 

 little produced, acute. 



The copulatory organs afford excellent specific characters, but as all speci- 

 mens in the Agassiz collection are far from adult I have not figured these organs ; 

 in the recently published description of this species, quoted above, 1 have given 

 a preUminary representation of the organs and may now refer to that paper. 



One of the largest specimens in the Agassiz collection is only a little more 

 than half-grown and measures 11 mm. in length, while adults are generally 

 18-22 mm. long. 



Remarks. — This species is closely allied and similar to E. luccns H. J. H. 

 ( = E. splendens sens. G. 0. S.), but it is well distinguished by a few small char- 



