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between New Zealand and Chili ; the species in thus dis- 

 tributed around the globe in a proportionately narrow belt 

 North of the Antarctic. 



Pseudeuphausia H. J. H. 



Only one species, P. latifrons G. O. S., is known. The 

 genus was established and the species redescribed in the 

 « Siboga » report. It is known from the Southern end of 

 Africa (Stebbing) through the Indian Ocean to the tropical 

 East Pacific and off South-East Australia. 



Thysanoëssa Brandt. 



This genus is rather difficult and imperfectly known. 

 As shown above, the genus Rhoda cannot be maintained 

 as different from Thysanoëssa^ and as the two features, 

 viz. constricted eyes and first pair of thoracic legs elongate 

 and thickened, hitherto considered the main characters of 

 Thysanoëssa show exceptions, it is necessary to give a new 

 diagnosis of the genus. 



Description. — Rostrum always good-sized, rather 

 long to very long. Eyes sometimes almost completely 

 circular, generally distinctly or considerably higher than 

 broad, narrowing upwards and most frequently above the 

 middle divided by a transverse constriction. Antennulae 

 with the peduncles showing sexual differences and their 

 two distal joints slender in the female ; upper flagellum at 

 most somewhat longer than the peduncles, frequently 

 much shorter. Five anterior pairs of thoracic legs with 

 full number of joints; first pair frequently elongate and 

 thickened, but with setœ or spines along the whole margin 

 of sixth and seventh joint ; sixth pair with the exopod nor- 

 mally developed, the endopod wanting in the males, in 

 adult females always present, articulated to the broad, 



