LEPTOSTRACA, SCHIZOPODA AND STOMATOPODA. 161 



Euphausia mutica is, according to HANSEN, known from the tropical and southern 

 Atlantic, Red Sea, Indian Ocean, and various parts of the North Pacific. 



Euphausia latifrons, G. O. SARS. Plate I., figs. 1 and 2. 



Localities : 



South end of Red Sea, surface tow-net. Three, 3 to 5 millims. 



Indian Ocean, between Sokotra and the Laccadive Islands, surface tow-net. One, 

 8 millims. 



Off Kalpentyn Island, Ceylon, February 3, 1902, surface tow-net ah 1 night and 

 early morning. Fourteen, 8 to 10 millims. 



Watering Point, Galle, February 15, 1902, surface tow-net. One, 7 '5 millims. 



Off Mutwal Island, Ceylon, March 19. 1902, surface tow-net. One, 8 millims., and 

 two larvse. 



North-east of Chilaw Paar, Ceylon, March 20, 1902, surface tow-net. Two, 4 and 

 6 millim. 



Periya Paar, November 13, 1902, from stomach of a ray, Dicerobatis ergoodoo. 

 Several hundreds, 8 to 10 millims. 



The carapace is about half as long as the pleon, and has a single lateral denticle 

 placed near the posterior end of its inferior margin just in front of the luminous 

 organs of the penultimate thoracic limbs. It is produced in front into a squarely 

 truncate 'or slightly emarginate rostral projection, the lateral angles of which are 

 somewhat acutely pointed. The antero-lateral corners are pointed, and there is no 

 very prominent dorsal keel. 



The segments of the pleon decrease in depth posteriorly. The first five are sub- 

 equal in length, while tne sixth is about one and a half times as long as the preceding 

 segment and has its posterior median dorsal border very slightly acuminate. The 

 preanal spine is well developed, curved and simple. The epimera of the .first five 

 segments are rounded, those of the last segment slightly acuminate. 



The eyes are rather small with the pigment black. 



The antennular peduncle (figs. 1 and 2) is rather stout, with the basal joint slightly 

 longer than the terminal two combined. The outer distal corner of the basal joint 

 is produced into a short spine, while its inner distal margin bears about six long plumose 

 setae which interlock with those of the other peduncle. On the dorsal surface there 

 is a leaflet running obliquely across the distal end of the basal joint. The leaflet is 

 strongly curved, and the external half of its margin is divided up into eleven acutely 

 pointed lappets. The external part of the leaflet overhangs the spine on the outer 

 distal corner of the basal joint. The second joint of the peduncle is longer than the 

 third. 



The antennal peduncle is about as long as the scale, and has the terminal joint 

 almost as long as the basal two combined. 



The antennal scale extends to the distal end of the second joint of the antennular 



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