spécimen, a femalc, 17'™, but numerous adult spécimens are 

 considerably smaller, measuring only about 1 i-i3 mm . 



Distribution. — This species has never been found in the 

 North Atlantic. The Copenhagen Muséum possesses a rich 

 material from in ail 28 localities, and my statements are founded 

 exclusi-vely on that collection. The species is common in the 

 South Atlantic from lat. 38° S. to lat. 29 0 20' S., and some spé- 

 cimens have been captured in lat. 1 8° S., long. 2 0 W.; furthermore 

 it is common in the area between lat. 3o° S. and lat. 40 0 S. from 

 the Cape of Good Hope to about long. ioo° E.; finally some 

 spécimens have been taken near the southern end of Japan, viz. 

 in lat. 3i° 20' N., long. i32° 29' E. 



Remarks. — The maie is easily distinguished from every other 

 species by the shape of the antennular leaflet ; the most valuable 

 différence between the female of this species and of the two 

 following forms is the armature of second antennular joint, 

 but the shape and direction of the leaflet can also be used. — 

 As to two of the figures given by Sars I refer to « Remarks » on 

 E. mutica. 



Euphausia mutica, n. sp. 



Description. — Front part of carapace and rostrum shaped 

 as in E. recurva. Leaflet on first antennular joint similar in 

 both sexes, rather narrow, directed upwards and somewhat or 

 much forwards, distally deeply cleft by a subtriangular incision ; 

 each latéral part is produced into a setiform process. Second 

 antennular joint has both distal angles on the upper side similar 

 in shape, either obtuse or each armed with an obliquely conical 

 tubercle, but a slender spiniform process is never found. — 

 Length of a large spécimen (in the Siboga collection) i5 mm . 



Distribution. — No spécimen is found in the Monaco material 

 collected during 1904; the species seems to be wanting in the 

 eastern Atlantic from Great Britain to a little south of the 

 Canary Islands. But it has been taken in the Sargasso Sea west 

 of long. 40 0 W., south of lat. 42 0 N. (Monaco : stat. 1 37 and 

 stat. 142; Copenhagen Muséum), in lat. 24 0 N., long. 22 0 W., 

 and in the tropical and southern Atlantic to lat. 38° S. Besides 



